diff --git a/ps3_ppu/Makefile.PS3_PPU b/ps3_ppu/Makefile.PS3_PPU
index 1ff0e0c..5fb3732 100644
--- a/ps3_ppu/Makefile.PS3_PPU
+++ b/ps3_ppu/Makefile.PS3_PPU
@@ -33,7 +33,7 @@ endif
 TARGET		:=	libnfs
 BUILD		:=	build-ppu
 SOURCE		:=	lib mount portmap nfs nfs4 nsm rquota nlm ps3_ppu
-INCLUDE		:=	include include/nfsc ps3_ppu nfs mount portmap
+INCLUDE		:=	include include/nfsc ps3_ppu nfs nfs4 mount portmap
 DATA		:=	data
 LIBS		:=