1 files changed, 1 insertions, 1 deletions
diff --git a/regenc.c b/regenc.c
index f31c4ffdd2..a67774e30b 100644
--- a/regenc.c
+++ b/regenc.c
@@ -97,7 +97,7 @@ onigenc_get_prev_char_head(OnigEncoding enc, const UChar* start, const UChar* s,
 }
 
 extern UChar*
-onigenc_step_back(OnigEncoding enc, const UChar* start, const UChar* s, int n)
+onigenc_step_back(OnigEncoding enc, const UChar* start, const UChar* s, const UChar* end, int n)
 {
   while (ONIG_IS_NOT_NULL(s) && n-- > 0) {
     if (s <= start)