diff --git a/lib/libpmc/Makefile b/lib/libpmc/Makefile
index 4258cb18c8c8..a44aacecce97 100644
--- a/lib/libpmc/Makefile
+++ b/lib/libpmc/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.1 2002/08/09 00:03:15 thorpej Exp $
+#	$NetBSD: Makefile,v 1.2 2016/01/23 21:44:55 christos Exp $
 
 .include <bsd.own.mk>
 
@@ -8,6 +8,7 @@ MAN=	pmc.3
 LIB=	pmc
 SRCS=	pmc.c
 SRCS+=	pmc_${MACHINE_CPU}.c
+CPPFLAGS+=	-D_KERNTYPES
 
 INCS=	pmc.h
 INCSDIR=/usr/include