diff --git a/client/mysql.cc b/client/mysql.cc
index cf80a5594e4..14fb1e1f917 100644
--- a/client/mysql.cc
+++ b/client/mysql.cc
@@ -2406,7 +2406,7 @@ com_shell(String *buffer, char *line __attribute__((unused)))
   char *shell_cmd;
 
   /* Skip space from line begin */
-  while (isspace(*line))
+  while (my_isspace(charset_info, *line))
     line++;
   if (!(shell_cmd = strchr(line, ' ')))
   {