diff --git a/sys/boot/i386/gptboot/Makefile b/sys/boot/i386/gptboot/Makefile
index 3b43537f4ccb..a0fad610c000 100644
--- a/sys/boot/i386/gptboot/Makefile
+++ b/sys/boot/i386/gptboot/Makefile
@@ -36,6 +36,7 @@ CFLAGS=	-DBOOTPROG=\"gptboot\" \
 	-I${.CURDIR}/../common \
 	-I${.CURDIR}/../btx/lib -I. \
 	-I${.CURDIR}/../boot2 \
+	-I${.CURDIR}/../../.. \
 	-Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
 	-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
 	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \