diff --git a/tools/build/Makefile b/tools/build/Makefile
index 604885dea4c..f0856900b28 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -395,10 +395,8 @@ SYSINCS+=	${SRCTOP}/sys/sys/ctf.h
 SYSINCS+=	${SRCTOP}/sys/sys/kbio.h
 # for kldxref:
 SYSINCS+=	${SRCTOP}/sys/sys/module.h
-.if ${.MAKE.OS} != "FreeBSD"
 # for libmd:
 SYSINCS+=	${SRCTOP}/sys/sys/md4.h
-.endif
 
 # We want to run the build with only ${WORLDTMP} in $PATH to ensure we don't
 # accidentally run tools that are incompatible but happen to be in $PATH.