diff --git a/regcomp.c b/regcomp.c
index 49103afea1..7ce5113985 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -2233,7 +2233,7 @@ get_min_match_length(Node* node, OnigDistance *min, ScanEnv* env)
           *min = en->min_len;
         else {
 	  if (IS_ENCLOSE_MARK1(NENCLOSE(node)))
-	    *min = 0;  // recursive
+	    *min = 0;  /* recursive */
 	  else {
 	    SET_ENCLOSE_STATUS(node, NST_MARK1);
 	    r = get_min_match_length(en->target, min, env);