diff --git a/src/SciMoz/nsSciMozCocoa.mm b/src/SciMoz/nsSciMozCocoa.mm
index 4dcc6b845d..df1d6a7a58 100644
--- a/src/SciMoz/nsSciMozCocoa.mm
+++ b/src/SciMoz/nsSciMozCocoa.mm
@@ -532,8 +532,11 @@ static bool hasEmptyRect(NPCocoaEvent *event) {
 #endif
         return kNPEventNotHandled;
     }
-#ifdef SCIMOZ_COCOA_DEBUG
+
     NPCocoaEvent *event = (NPCocoaEvent *) ev;
+    if (event->type == NPCocoaEventWindowFocusChanged && event->data.focus.hasFocus)
+        [visibilityTimer startTimer]; // ensure view is visible after un-hide
+#ifdef SCIMOZ_COCOA_DEBUG
     if (event->type != NPCocoaEventMouseMoved)
         fprintf(stderr, "PlatformHandleEvent: event #%d\n", event->type);
 #endif