---
 strings/ctype-simple.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- strings/ctype-simple.c.orig
+++ strings/ctype-simple.c
@@ -881,7 +881,7 @@ int my_longlong10_to_str_8bit(CHARSET_IN
   {
     if (val < 0)
     {
-      val = -val;
+      val = -(ulonglong)val;
       *dst++= '-';
       len--;
       sign= 1;