diff --git a/src/af.ui.js b/src/af.ui.js
index acb2d69c1..75a30a38d 100644
--- a/src/af.ui.js
+++ b/src/af.ui.js
@@ -619,7 +619,7 @@
          */
         showMask: function(text, value) {
             if (!text) text = this.loadingText || "";
-            if (!value || typeof value !== "number") timeout = 15000;
+            if (!value || typeof value !== "number") value = 15000;
             $.query("#afui_mask>h1").html(text);
             $.query("#afui_mask").show();
             this.showingMask = true;