diff --git a/src/errors.h b/src/errors.h
index 3b15d10..3468ab7 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -650,3 +650,5 @@
 	INIT(= N_("E1232: Argument of exists_compiled() must be a literal string"));
 EXTERN char e_exists_compiled_can_only_be_used_in_def_function[]
 	INIT(= N_("E1233: exists_compiled() can only be used in a :def function"));
+EXTERN char e_legacy_must_be_followed_by_command[]
+	INIT(= N_("E1234: legacy must be followed by a command"));