diff --git a/docshell/base/makefile.win b/docshell/base/makefile.win
index 0642af69d14..a6974f7b661 100644
--- a/docshell/base/makefile.win
+++ b/docshell/base/makefile.win
@@ -28,7 +28,6 @@ XPIDLSRCS=						\
 		.\nsIDocShellContainer.idl			\
 		.\nsIDocShellFile.idl	\
 		.\nsIDocShellEdit.idl	\
-		.\nsIGenericWindow.idl	\
 		.\nsIScrollable.idl		\
 		.\nsITextScroll.idl		\
 		$(NULL)
diff --git a/docshell/base/nsIGenericWindow.idl b/docshell/base/nsIGenericWindow.idl
deleted file mode 100644
index e69de29bb2d..00000000000