diff --git a/Documentation/networking/Makefile b/Documentation/networking/Makefile
index 5aba7a33aeeb7bacedb28a596e4cdaed848d0162..24c308dd3fd183f70e8d151fb19a59aa475de02e 100644
--- a/Documentation/networking/Makefile
+++ b/Documentation/networking/Makefile
@@ -4,6 +4,8 @@ obj- := dummy.o
 # List of programs to build
 hostprogs-y := ifenslave
 
+HOSTCFLAGS_ifenslave.o += -I$(objtree)/usr/include
+
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)