diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index e6d8255..120861a 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -1974,7 +1974,7 @@
 nfa_do_multibyte:
 		/* plen is length of current char with composing chars */
 		if (enc_utf8 && ((*mb_char2len)(c)
-			    != (plen = (*mb_ptr2len)(old_regparse))
+			    != (plen = utfc_ptr2len(old_regparse))
 						       || utf_iscomposing(c)))
 		{
 		    int i = 0;