diff --git a/layout/xul/nsXULLabelFrame.h b/layout/xul/nsXULLabelFrame.h
index f420ccfd9120..b23f730df5f8 100644
--- a/layout/xul/nsXULLabelFrame.h
+++ b/layout/xul/nsXULLabelFrame.h
@@ -12,10 +12,6 @@
 #include "mozilla/Attributes.h"
 #include "nsBlockFrame.h"
 
-#ifndef MOZ_XUL
-#error "This file should not be included"
-#endif
-
 class nsXULLabelFrame final : public nsBlockFrame
 {
 public: