diff --git a/src/errors.h b/src/errors.h
index e33f2e6..26629b0 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3401,3 +3401,9 @@
 EXTERN char e_cannot_add_textprop_with_text_after_using_textprop_with_negative_id[]
 	INIT(= N_("E1339: Cannot add a textprop with text after using a textprop with a negative id"));
 #endif
+#ifdef FEAT_EVAL
+EXTERN char e_argument_already_declared_in_class_str[]
+	INIT(= N_("E1340: Argument already declared in the class: %s"));
+EXTERN char e_variable_already_declared_in_class_str[]
+	INIT(= N_("E1341: Variable already declared in the class: %s"));
+#endif
diff --git a/src/version.c b/src/version.c
index dc320be..5efbf60 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1128,
+/**/
     1127,
 /**/
     1126,
diff --git a/src/vim9class.c b/src/vim9class.c
index 8e05a17..e764f70 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -827,7 +827,8 @@
     size_t len = name_end - name;
     typval_T tv;
     tv.v_type = VAR_UNKNOWN;
-    if (eval_variable(name, len, 0, &tv, NULL, EVAL_VAR_NOAUTOLOAD) == FAIL)
+    if (eval_variable(name, (int)len,
+				    0, &tv, NULL, EVAL_VAR_NOAUTOLOAD) == FAIL)
 	return NULL;
     if (tv.v_type != VAR_CLASS && tv.v_type != VAR_OBJECT)
 	goto fail_after_eval;