diff --git a/client/mysql.cc b/client/mysql.cc
index 6c8485a5143..d5001d335b6 100644
--- a/client/mysql.cc
+++ b/client/mysql.cc
@@ -2671,7 +2671,7 @@ static int fake_magic_space(const char *, int)
 static void initialize_readline ()
 {
   /* Allow conditional parsing of the ~/.inputrc file. */
-  rl_readline_name= "mysql";
+  rl_readline_name= (char *) "mysql";
   rl_terminal_name= getenv("TERM");
 
   /* Tell the completer that we want a crack first. */