diff --git a/src/viewer.js b/src/viewer.js
index a879a0bd..cf28f7b7 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2657,8 +2657,8 @@ function onCanvasKeyDown( event ) {
     var canvasKeyDownEventArgs = {
       originalEvent: event.originalEvent,
       preventDefaultAction: false,
-      preventVerticalPan: event.preventVerticalPan,
-      preventHorizontalPan: event.preventHorizontalPan
+      preventVerticalPan: !this.panVertical,
+      preventHorizontalPan: !this.panHorizontal
     };
 
     /**
diff --git a/test/demo/basic.html b/test/demo/basic.html
index 44bf70a4..af1bfb0d 100644
--- a/test/demo/basic.html
+++ b/test/demo/basic.html
@@ -21,12 +21,13 @@
     <script type="text/javascript">
 
         var viewer = OpenSeadragon({
-            // debugMode: true,
+            debugMode: true,
             id: "contentDiv",
             prefixUrl: "../../build/openseadragon/images/",
             tileSources: "../data/testpattern.dzi",
             showNavigator:true,
-            panHorizontal: false
+            panVertical: false,
+            panHorizontal: true
         });
     </script>
 </body>