diff --git a/layout/base/public/MANIFEST b/layout/base/public/MANIFEST
index 86cd2a4342b3..8a29145b9bcd 100644
--- a/layout/base/public/MANIFEST
+++ b/layout/base/public/MANIFEST
@@ -3,7 +3,6 @@
 #
 nslayout.h
 nsIContent.h
-nsIContentDelegate.h
 nsIDocument.h
 nsIDocumentContainer.h
 nsIDocumentObserver.h