diff --git a/client/mysql.cc b/client/mysql.cc
index d30b60732bc..8f118a06935 100644
--- a/client/mysql.cc
+++ b/client/mysql.cc
@@ -1290,9 +1290,7 @@ static bool add_line(String &buffer,char *line,char *in_string,
   if (status.add_to_history && line[0] && not_in_history(line))
     add_history(line);
 #endif
-#ifdef USE_MB
   char *end_of_line=line+(uint) strlen(line);
-#endif
 
   for (pos=out=line ; (inchar= (uchar) *pos) ; pos++)
   {
@@ -1382,7 +1380,7 @@ static bool add_line(String &buffer,char *line,char *in_string,
       }
     }
     else if (!*ml_comment && !*in_string &&
-             strlen(pos) >= 10 &&
+             (end_of_line - pos) >= 10 &&
              !my_strnncoll(charset_info, (uchar*) pos, 10,
                            (const uchar*) "delimiter ", 10))
     {