diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index 37497be8afa7..3fe1372af4f5 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -4438,7 +4438,6 @@ nsWindow::ProcessMessageForPlugin(const MSG &aMsg,
 
     case WM_DEADCHAR:
     case WM_SYSDEADCHAR:
-    case WM_CONTEXTMENU:
 
     case WM_CUT:
     case WM_COPY: