diff --git a/DLPanableWebView/DLPanableWebView.m b/DLPanableWebView/DLPanableWebView.m
index cd2a021..adce947 100644
--- a/DLPanableWebView/DLPanableWebView.m
+++ b/DLPanableWebView/DLPanableWebView.m
@@ -204,9 +204,9 @@ - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)
     BOOL isHTTPOrFile = [request.URL.scheme isEqualToString:@"http"] || [request.URL.scheme isEqualToString:@"https"] || [request.URL.scheme isEqualToString:@"file"];
     if (ret && !isFragmentJump && isHTTPOrFile && isTopLevelNavigation) {
         if ((navigationType == UIWebViewNavigationTypeLinkClicked || navigationType == UIWebViewNavigationTypeOther) && [[webView.request.URL description] length]) {
-            if (![[[historyStack_ lastObject] objectForKey:@"url"] isEqualToString:[self.request.URL description]]) {
+            if (![[[historyStack_ lastObject] objectForKey:@"url"] isEqualToString:[self.request.mainDocumentURL description]]) {
                 UIImage *curPreview = [DLPanableWebView screenshotOfView:self];
-                [historyStack_ addObject:@{@"preview":curPreview, @"url":[self.request.URL description]}];
+                [historyStack_ addObject:@{@"preview":curPreview, @"url":[self.request.mainDocumentURL description]}];
             }
         }
     }