diff --git a/src/errors.h b/src/errors.h
index e08186e..6f25af6 100644
--- a/src/errors.h
+++ b/src/errors.h
@@ -1346,7 +1346,8 @@
 EXTERN char e_commentstring_must_be_empty_or_contain_str[]
 	INIT(= N_("E537: 'commentstring' must be empty or contain %s"));
 #endif
-// E538 unused
+EXTERN char e_pattern_found_in_every_line_str[]
+	INIT(= N_("E538: Pattern found in every line: %s"));
 EXTERN char e_illegal_character_str[]
 	INIT(= N_("E539: Illegal character <%s>"));
 #ifdef FEAT_STL_OPT