diff --git a/sys/conf/Makefile.mips b/sys/conf/Makefile.mips
index 0060ad7f03d..add27c1752a 100644
--- a/sys/conf/Makefile.mips
+++ b/sys/conf/Makefile.mips
@@ -28,7 +28,7 @@ S=	../../..
 .endif
 .include "$S/conf/kern.pre.mk"
 
-INCLUDES+= -I$S/contrib/libfdt
+INCLUDES+= -I$S/contrib/libfdt -I$S/contrib/device-tree/include
 
 LDSCRIPT_NAME?=ldscript.$M
 SYSTEM_LD:= ${SYSTEM_LD:$S/conf/${LDSCRIPT_NAME}=${LDSCRIPT_NAME}}