diff --git a/src/errors.h b/src/errors.h
index 6bab826..4d2818a 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -3619,8 +3619,10 @@
 	INIT(= N_("E1429: Class can only be used in a script"));
 EXTERN char e_uninitialized_object_var_reference[]
 	INIT(= N_("E1430: Uninitialized object variable '%s' referenced"));
+EXTERN char e_abstract_method_str_direct[]
+	INIT(= N_("E1431: Abstract method \"%s\" in class \"%s\" cannot be accessed directly"));
 #endif
-// E1431 - E1499 unused (reserved for Vim9 class support)
+// E1432 - E1499 unused (reserved for Vim9 class support)
 EXTERN char e_cannot_mix_positional_and_non_positional_str[]
 	INIT(= N_("E1500: Cannot mix positional and non-positional arguments: %s"));
 EXTERN char e_fmt_arg_nr_unused_str[]