diff --git a/webshell/tests/viewer/nsViewer.cpp b/webshell/tests/viewer/nsViewer.cpp
index 879551aea70..4bf9054a677 100644
--- a/webshell/tests/viewer/nsViewer.cpp
+++ b/webshell/tests/viewer/nsViewer.cpp
@@ -113,9 +113,6 @@ static NS_DEFINE_IID(kIScriptContextOwnerIID, NS_ISCRIPTCONTEXTOWNER_IID);
 static NS_DEFINE_IID(kIChildWidgetIID, NS_IWIDGET_IID);
 
 #define VIEWER_UI
-#if !defined(XP_PC)
-#undef  VIEWER_UI
-#endif
 #undef INSET_WEBWIDGET
 
 #ifdef VIEWER_UI