diff --git a/lib/readline/display.c b/lib/readline/display.c
--- a/lib/readline/display.c
+++ b/lib/readline/display.c
@@ -2683,11 +2683,8 @@ rl_forced_update_display (void)
   register char *temp;
 
   if (visible_line)
-    {
-      temp = visible_line;
-      while (*temp)
-	*temp++ = '\0';
-    }
+    memset (visible_line, 0, line_size);
+
   rl_on_new_line ();
   forced_display++;
   (*rl_redisplay_function) ();
diff --git a/patchlevel.h b/patchlevel.h
index 1712b108..e5e8cabd 100644
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 21
+#define PATCHLEVEL 22
 
 #endif /* _PATCHLEVEL_H_ */