diff --git a/ipc/glue/WindowsMessageLoop.cpp b/ipc/glue/WindowsMessageLoop.cpp
index c8713369979..27fd46d51f2 100644
--- a/ipc/glue/WindowsMessageLoop.cpp
+++ b/ipc/glue/WindowsMessageLoop.cpp
@@ -1132,6 +1132,8 @@ MessageChannel::WaitForInterruptNotify()
       NS_ASSERTION(timerId, "SetTimer failed!");
     }
 
+    NeuteredWindowRegion neuteredRgn(true);
+
     MSG msg = { 0 };
 
     // Don't get wrapped up in here if the child connection dies.