diff --git a/xkb/xkbtext.c b/xkb/xkbtext.c
index 593c157d7..1b0e6f409 100644
--- a/xkb/xkbtext.c
+++ b/xkb/xkbtext.c
@@ -1262,7 +1262,7 @@ XkbActionText(XkbDescPtr xkb, XkbAction *action, unsigned format)
 char *
 XkbBehaviorText(XkbDescPtr xkb, XkbBehavior * behavior, unsigned format)
 {
-    char buf[256];
+    char buf[256] = "";
 
     if (format == XkbCFile) {
         if (behavior->type == XkbKB_Default)