diff --git a/src/errors.h b/src/errors.h
index 5ac7b3f..e08186e 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -2786,7 +2786,10 @@
 # endif
 EXTERN char e_missing_argument_type_for_str[]
 	INIT(= N_("E1077: Missing argument type for %s"));
-// E1078 unused
+#endif
+EXTERN char e_invalid_command_nested_did_you_mean_plusplus_nested[]
+	INIT(= N_("E1078: Invalid command \"nested\", did you mean \"++nested\"?"));
+#ifdef FEAT_EVAL
 EXTERN char e_cannot_declare_variable_on_command_line[]
 	INIT(= N_("E1079: Cannot declare a variable on the command line"));
 EXTERN char e_invalid_assignment[]