diff --git a/strings/ctype-mb.c b/strings/ctype-mb.c
index ba53ebfb64c..dd6fbee8e17 100644
--- a/strings/ctype-mb.c
+++ b/strings/ctype-mb.c
@@ -292,7 +292,7 @@ uint my_instr_mb(CHARSET_INFO *cs,
         match->end= 0;
         match->mblen= 0;
       }
-      return 1;		// Empty string is always found
+      return 1;		/* Empty string is always found */
     }
     
     big0= big;