1 files changed, 1 insertions, 1 deletions
diff --git a/regenc.c b/regenc.c
index 288eac433d..e628d62357 100644
--- a/regenc.c
+++ b/regenc.c
@@ -52,7 +52,7 @@ onigenc_set_default_encoding(OnigEncoding enc)
 }
 
 extern int
-onigenc_mbclen_approximate(const OnigUChar* p,const OnigUChar* e, struct OnigEncodingTypeST* enc)
+onigenc_mbclen_approximate(const OnigUChar* p,const OnigUChar* e, OnigEncoding enc)
 {
   int ret = ONIGENC_PRECISE_MBC_ENC_LEN(enc,p,e);
   if (ONIGENC_MBCLEN_CHARFOUND_P(ret))