diff --git a/src/evalvars.c b/src/evalvars.c
index 9e11578..fde80d7 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -1663,10 +1663,20 @@
     dict_T	*d;
     dictitem_T	*di;
 
+    // can't :unlet a script variable in Vim9 script
     if (in_vim9script() && check_vim9_unlet(name) == FAIL)
 	return FAIL;
 
     ht = find_var_ht(name, &varname);
+
+    // can't :unlet a script variable in Vim9 script from a function
+    if (ht == get_script_local_ht()
+	    && SCRIPT_ID_VALID(current_sctx.sc_sid)
+	    && SCRIPT_ITEM(current_sctx.sc_sid)->sn_version
+							 == SCRIPT_VERSION_VIM9
+	    && check_vim9_unlet(name) == FAIL)
+	return FAIL;
+
     if (ht != NULL && *varname != NUL)
     {
 	d = get_current_funccal_dict(ht);
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index 60c8fe9..ad7b85b 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -1211,6 +1211,14 @@
   CheckScriptFailure([
    'vim9script',
    'var svar = 123',
+   'func Func()',
+   '  unlet s:svar',
+   'endfunc',
+   'Func()',
+   ], 'E1081:')
+  CheckScriptFailure([
+   'vim9script',
+   'var svar = 123',
    'def Func()',
    '  unlet s:svar',
    'enddef',
diff --git a/src/version.c b/src/version.c
index be2b33c..70ff9a4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2157,
+/**/
     2156,
 /**/
     2155,