diff --git a/src/proto/userfunc.pro b/src/proto/userfunc.pro
index e5d78b6..7b4129b 100644
--- a/src/proto/userfunc.pro
+++ b/src/proto/userfunc.pro
@@ -47,7 +47,7 @@
 char_u *alloc_printable_func_name(char_u *fname);
 char_u *save_function_name(char_u **name, int *is_global, int skip, int flags, funcdict_T *fudi);
 void list_functions(regmatch_T *regmatch);
-ufunc_T *define_function(exarg_T *eap, char_u *name_arg, garray_T *lines_to_free, int class_flags);
+ufunc_T *define_function(exarg_T *eap, char_u *name_arg, garray_T *lines_to_free, int class_flags, ocmember_T *obj_members, int obj_member_count);
 void ex_function(exarg_T *eap);
 ufunc_T *find_func_by_name(char_u *name, compiletype_T *compile_type);
 void ex_defcompile(exarg_T *eap);
diff --git a/src/proto/vim9instr.pro b/src/proto/vim9instr.pro
index 3f287d0..aef934f 100644
--- a/src/proto/vim9instr.pro
+++ b/src/proto/vim9instr.pro
@@ -58,7 +58,7 @@
 int generate_BCALL(cctx_T *cctx, int func_idx, int argcount, int method_call);
 int generate_LISTAPPEND(cctx_T *cctx);
 int generate_BLOBAPPEND(cctx_T *cctx);
-int generate_CALL(cctx_T *cctx, ufunc_T *ufunc, class_T *cl, int mi, type_T *mtype, int pushed_argcount);
+int generate_CALL(cctx_T *cctx, ufunc_T *ufunc, class_T *cl, int mi, int pushed_argcount);
 int generate_UCALL(cctx_T *cctx, char_u *name, int argcount);
 int check_func_args_from_type(cctx_T *cctx, type_T *type, int argcount, int at_top, char_u *name);
 int generate_PCALL(cctx_T *cctx, int argcount, char_u *name, type_T *type, int at_top);
diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index 6c33816..87679d8 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -921,6 +921,27 @@
       Check()
   END
   v9.CheckSourceFailure(lines, 'E1013:')
+
+  lines =<< trim END
+      vim9script
+
+      class C
+        this.str: string
+        def new(str: any)
+        enddef
+      endclass
+
+      def Check()
+        try
+          var c = C.new(1)
+        catch
+          assert_report($'Unexpected exception was caught: {v:exception}')
+        endtry
+      enddef
+
+      Check()
+  END
+  v9.CheckSourceSuccess(lines)
 enddef
 
 def Test_class_object_member_inits()
diff --git a/src/userfunc.c b/src/userfunc.c
index efde29d..a27ff98 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -65,6 +65,7 @@
 	garray_T    *newargs,
 	garray_T    *argtypes,
 	int	    types_optional,
+	garray_T    *arg_objm,
 	evalarg_T   *evalarg,
 	exarg_T	    *eap,
 	int	    is_vararg,
@@ -136,7 +137,8 @@
     }
 
     // get any type from "arg: type"
-    if (argtypes != NULL && (skip || ga_grow(argtypes, 1) == OK))
+    if (argtypes != NULL && (skip || ga_grow(argtypes, 1) == OK)
+		&& arg_objm != NULL && (skip || ga_grow(arg_objm, 1) == OK))
     {
 	char_u *type = NULL;
 
@@ -172,6 +174,7 @@
 		type = vim_strsave((char_u *)
 					    (is_vararg ? "list<any>" : "any"));
 	    ((char_u **)argtypes->ga_data)[argtypes->ga_len++] = type;
+	    ((int8_T *)arg_objm->ga_data)[arg_objm->ga_len++] = FALSE;
 	}
     }
 
@@ -221,6 +224,7 @@
     garray_T	*newargs,
     garray_T	*argtypes,	// NULL unless using :def
     int		types_optional,	// types optional if "argtypes" is not NULL
+    garray_T	*arg_objm,	// NULL unless using :def
     evalarg_T	*evalarg,	// context or NULL
     int		*varargs,
     garray_T	*default_args,
@@ -241,6 +245,8 @@
 	ga_init2(newargs, sizeof(char_u *), 3);
     if (argtypes != NULL)
 	ga_init2(argtypes, sizeof(char_u *), 3);
+    if (arg_objm != NULL)
+	ga_init2(arg_objm, sizeof(int8_T), 3);
     if (!skip && default_args != NULL)
 	ga_init2(default_args, sizeof(char_u *), 3);
 
@@ -295,7 +301,7 @@
 
 		arg = p;
 		p = one_function_arg(p, newargs, argtypes, types_optional,
-						     evalarg, eap, TRUE, skip);
+					arg_objm, evalarg, eap, TRUE, skip);
 		if (p == arg)
 		    break;
 		if (*skipwhite(p) == '=')
@@ -350,11 +356,13 @@
 					       vim_strnsave(arg, argend - arg);
 		newargs->ga_len++;
 
-		if (argtypes != NULL && ga_grow(argtypes, 1) == OK)
+		if (argtypes != NULL && ga_grow(argtypes, 1) == OK
+			    && arg_objm != NULL && ga_grow(arg_objm, 1) == OK)
 		{
 		    // TODO: use the actual type
 		    ((char_u **)argtypes->ga_data)[argtypes->ga_len++] =
 						  vim_strsave((char_u *)"any");
+		    ((int8_T *)arg_objm->ga_data)[arg_objm->ga_len++] = TRUE;
 
 		    // Add a line to the function body for the assignment.
 		    if (ga_grow(newlines, 1) == OK)
@@ -391,7 +399,7 @@
 
 	    arg = p;
 	    p = one_function_arg(p, newargs, argtypes, types_optional,
-						    evalarg, eap, FALSE, skip);
+					arg_objm, evalarg, eap, FALSE, skip);
 	    if (p == arg)
 		break;
 
@@ -490,7 +498,13 @@
  * Return OK or FAIL.
  */
     static int
-parse_argument_types(ufunc_T *fp, garray_T *argtypes, int varargs)
+parse_argument_types(
+	ufunc_T *fp,
+	garray_T *argtypes,
+	int varargs,
+	garray_T *arg_objm,
+	ocmember_T *obj_members,
+	int obj_member_count)
 {
     int len = 0;
 
@@ -516,7 +530,24 @@
 		    // will get the type from the default value
 		    type = &t_unknown;
 		else
-		    type = parse_type(&p, &fp->uf_type_list, TRUE);
+		{
+		    if (arg_objm != NULL && ((int8_T *)arg_objm->ga_data)[i])
+		    {
+			char_u *aname = ((char_u **)fp->uf_args.ga_data)[i];
+
+			type = &t_any;
+			for (int om = 0; om < obj_member_count; ++om)
+			{
+			    if (STRCMP(aname, obj_members[om].ocm_name) == 0)
+			    {
+				type = obj_members[om].ocm_type;
+				break;
+			    }
+			}
+		    }
+		    else
+			type = parse_type(&p, &fp->uf_type_list, TRUE);
+		}
 		if (type == NULL)
 		    return FAIL;
 		fp->uf_arg_types[i] = type;
@@ -1395,7 +1426,7 @@
     SOURCING_LNUM = sourcing_lnum_top;
 
     // parse argument types
-    if (parse_argument_types(ufunc, argtypes, varargs) == FAIL)
+    if (parse_argument_types(ufunc, argtypes, varargs, NULL, NULL, 0) == FAIL)
     {
 	SOURCING_LNUM = lnum_save;
 	goto erret;
@@ -1464,6 +1495,7 @@
     garray_T	*pnewargs;
     garray_T	argtypes;
     garray_T	default_args;
+    garray_T	arg_objm;
     ufunc_T	*fp = NULL;
     partial_T   *pt = NULL;
     int		varargs;
@@ -1490,12 +1522,16 @@
     // be found after the arguments.
     s = *arg + 1;
     ret = get_function_args(&s, equal_arrow ? ')' : '-', NULL,
-	    types_optional ? &argtypes : NULL, types_optional, evalarg,
-			   NULL, &default_args, TRUE, NULL, FALSE, NULL, NULL);
+	    types_optional ? &argtypes : NULL, types_optional,
+			types_optional ? &arg_objm : NULL, evalarg,
+			NULL, &default_args, TRUE, NULL, FALSE, NULL, NULL);
     if (ret == FAIL || skip_arrow(s, equal_arrow, &ret_type, NULL) == NULL)
     {
 	if (types_optional)
+	{
 	    ga_clear_strings(&argtypes);
+	    ga_clear(&arg_objm);
+	}
 	return called_emsg == called_emsg_start ? NOTDONE : FAIL;
     }
 
@@ -1506,7 +1542,8 @@
 	pnewargs = NULL;
     *arg += 1;
     ret = get_function_args(arg, equal_arrow ? ')' : '-', pnewargs,
-	    types_optional ? &argtypes : NULL, types_optional, evalarg,
+	    types_optional ? &argtypes : NULL, types_optional,
+			types_optional ? &arg_objm : NULL, evalarg,
 					    &varargs, &default_args,
 					    FALSE, NULL, FALSE, NULL, NULL);
     if (ret == FAIL
@@ -1514,7 +1551,10 @@
 		equal_arrow || vim9script ? &white_error : NULL)) == NULL)
     {
 	if (types_optional)
+	{
 	    ga_clear_strings(&argtypes);
+	    ga_clear(&arg_objm);
+	}
 	ga_clear_strings(&newargs);
 	return white_error ? FAIL : NOTDONE;
     }
@@ -1631,7 +1671,7 @@
 	if (types_optional)
 	{
 	    if (parse_argument_types(fp, &argtypes,
-						vim9script && varargs) == FAIL)
+				vim9script && varargs, NULL, NULL, 0) == FAIL)
 		goto errret;
 	    if (ret_type != NULL)
 	    {
@@ -4591,7 +4631,9 @@
 	exarg_T	    *eap,
 	char_u	    *name_arg,
 	garray_T    *lines_to_free,
-	int	    class_flags)
+	int	    class_flags,
+	ocmember_T  *obj_members,
+	int         obj_member_count)
 {
     int		j;
     int		c;
@@ -4604,6 +4646,7 @@
     char_u	*line_arg = NULL;
     garray_T	newargs;
     garray_T	argtypes;
+    garray_T	arg_objm;
     garray_T	default_args;
     garray_T	newlines;
     int		varargs = FALSE;
@@ -4662,6 +4705,7 @@
 
     ga_init(&newargs);
     ga_init(&argtypes);
+    ga_init(&arg_objm);
     ga_init(&default_args);
 
     /*
@@ -4909,6 +4953,7 @@
     ++p;
     if (get_function_args(&p, ')', &newargs,
 			 eap->cmdidx == CMD_def ? &argtypes : NULL, FALSE,
+			 eap->cmdidx == CMD_def ? &arg_objm : NULL,
 			 NULL, &varargs, &default_args, eap->skip,
 			 eap, class_flags, &newlines, lines_to_free) == FAIL)
 	goto errret_2;
@@ -5252,7 +5297,8 @@
 	// The function may use script variables from the context.
 	function_using_block_scopes(fp, cstack);
 
-	if (parse_argument_types(fp, &argtypes, varargs) == FAIL)
+	if (parse_argument_types(fp, &argtypes, varargs, &arg_objm,
+					obj_members, obj_member_count) == FAIL)
 	{
 	    SOURCING_LNUM = lnum_save;
 	    free_fp = fp_allocated;
@@ -5352,6 +5398,7 @@
 	VIM_CLEAR(fp);
 ret_free:
     ga_clear_strings(&argtypes);
+    ga_clear(&arg_objm);
     vim_free(fudi.fd_newkey);
     if (name != name_arg)
 	vim_free(name);
@@ -5370,7 +5417,7 @@
     garray_T lines_to_free;
 
     ga_init2(&lines_to_free, sizeof(char_u *), 50);
-    (void)define_function(eap, NULL, &lines_to_free, 0);
+    (void)define_function(eap, NULL, &lines_to_free, 0, NULL, 0);
     ga_clear_strings(&lines_to_free);
 }
 
diff --git a/src/version.c b/src/version.c
index 3d663e1..574dedf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1928,
+/**/
     1927,
 /**/
     1926,
diff --git a/src/vim9class.c b/src/vim9class.c
index a2e305c..0b9ded7 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -1200,7 +1200,8 @@
     garray_T lines_to_free;
     ga_init2(&lines_to_free, sizeof(char_u *), 50);
 
-    ufunc_T *nf = define_function(&fea, NULL, &lines_to_free, CF_CLASS);
+    ufunc_T *nf = define_function(&fea, NULL, &lines_to_free, CF_CLASS,
+			    cl->class_obj_members, cl->class_obj_member_count);
 
     ga_clear_strings(&lines_to_free);
     vim_free(fga.ga_data);
@@ -1679,7 +1680,7 @@
 	    else
 		class_flags = CF_INTERFACE;
 	    ufunc_T *uf = define_function(&ea, NULL, &lines_to_free,
-								class_flags);
+			class_flags, objmembers.ga_data, objmembers.ga_len);
 	    ga_clear_strings(&lines_to_free);
 
 	    if (uf != NULL)
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 16898e3..c69afb9 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1101,7 +1101,7 @@
     int save_KeyTyped = KeyTyped;
     KeyTyped = FALSE;
 
-    ufunc = define_function(eap, lambda_name, lines_to_free, 0);
+    ufunc = define_function(eap, lambda_name, lines_to_free, 0, NULL, 0);
 
     KeyTyped = save_KeyTyped;
 
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 23dee1c..a53b1b3 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -4470,7 +4470,7 @@
 		    ea.cmd = ea.arg = iptr->isn_arg.string;
 		    ga_init2(&lines_to_free, sizeof(char_u *), 50);
 		    SOURCING_LNUM = iptr->isn_lnum;
-		    define_function(&ea, NULL, &lines_to_free, 0);
+		    define_function(&ea, NULL, &lines_to_free, 0, NULL, 0);
 		    ga_clear_strings(&lines_to_free);
 		}
 		break;
diff --git a/src/vim9expr.c b/src/vim9expr.c
index bcad79c..20289bf 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -395,8 +395,8 @@
 
 	if (type->tt_type == VAR_OBJECT
 		     && (cl->class_flags & (CLASS_INTERFACE | CLASS_EXTENDED)))
-	    return generate_CALL(cctx, ufunc, cl, fi, type, argcount);
-	return generate_CALL(cctx, ufunc, NULL, 0, type, argcount);
+	    return generate_CALL(cctx, ufunc, cl, fi, argcount);
+	return generate_CALL(cctx, ufunc, NULL, 0, argcount);
     }
 
     if (type->tt_type == VAR_OBJECT)
@@ -977,7 +977,6 @@
     int		has_g_namespace;
     ca_special_T special_fn;
     imported_T	*import;
-    type_T	*type;
 
     if (varlen >= sizeof(namebuf))
     {
@@ -1061,7 +1060,6 @@
     if (compile_arguments(arg, cctx, &argcount, special_fn) == FAIL)
 	goto theend;
 
-    type = get_decl_type_on_stack(cctx, 1);
     is_autoload = vim_strchr(name, AUTOLOAD_CHAR) != NULL;
     if (ASCII_ISLOWER(*name) && name[1] != ':' && !is_autoload)
     {
@@ -1079,6 +1077,8 @@
 
 	    if (STRCMP(name, "add") == 0 && argcount == 2)
 	    {
+		type_T	    *type = get_decl_type_on_stack(cctx, 1);
+
 		// add() can be compiled to instructions if we know the type
 		if (type->tt_type == VAR_LIST)
 		{
@@ -1128,7 +1128,7 @@
 	{
 	    if (!func_is_global(ufunc))
 	    {
-		res = generate_CALL(cctx, ufunc, NULL, 0, type, argcount);
+		res = generate_CALL(cctx, ufunc, NULL, 0, argcount);
 		goto theend;
 	    }
 	    if (!has_g_namespace
@@ -1147,7 +1147,7 @@
 	    if (cctx->ctx_ufunc->uf_defclass == cl)
 	    {
 		res = generate_CALL(cctx, cl->class_class_functions[mi], NULL,
-							0, type, argcount);
+							0, argcount);
 	    }
 	    else
 	    {
@@ -1175,7 +1175,7 @@
     // If we can find a global function by name generate the right call.
     if (ufunc != NULL)
     {
-	res = generate_CALL(cctx, ufunc, NULL, 0, type, argcount);
+	res = generate_CALL(cctx, ufunc, NULL, 0, argcount);
 	goto theend;
     }
 
diff --git a/src/vim9instr.c b/src/vim9instr.c
index b9bbfd0..96c02de 100644
--- a/src/vim9instr.c
+++ b/src/vim9instr.c
@@ -1784,7 +1784,6 @@
 	ufunc_T	    *ufunc,
 	class_T	    *cl,
 	int	    mi,
-	type_T	    *mtype,	// method type
 	int	    pushed_argcount)
 {
     isn_T	*isn;
@@ -1810,8 +1809,6 @@
     {
 	int		i;
 	compiletype_T	compile_type;
-	int		class_constructor = (mtype->tt_type == VAR_CLASS
-				    && STRNCMP(ufunc->uf_name, "new", 3) == 0);
 
 	for (i = 0; i < argcount; ++i)
 	{
@@ -1830,18 +1827,6 @@
 		if (ufunc->uf_arg_types == NULL)
 		    continue;
 		expected = ufunc->uf_arg_types[i];
-
-		// When the method is a class constructor and the formal
-		// argument is an object member, the type check is performed on
-		// the object member type.
-		if (class_constructor && expected->tt_type == VAR_ANY)
-		{
-		    class_T *clp = mtype->tt_class;
-		    char_u  *aname = ((char_u **)ufunc->uf_args.ga_data)[i];
-		    ocmember_T *m = object_member_lookup(clp, aname, 0, NULL);
-		    if (m != NULL)
-			expected = m->ocm_type;
-		}
 	    }
 	    else if (ufunc->uf_va_type == NULL
 					   || ufunc->uf_va_type == &t_list_any)