diff --git a/Makefile.inc1 b/Makefile.inc1
index e3707c7a504..b6843177c10 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -2739,7 +2739,6 @@ SUBDIR=	${SUBDIR_OVERRIDE}
 NXBMAKEARGS+= \
 	OBJTOP=${NXBOBJTOP:Q} \
 	OBJROOT=${NXBOBJROOT:Q} \
-	MAKEOBJDIRPREFIX= \
 	-DNO_SHARED \
 	-DNO_CPU_CFLAGS \
 	-DNO_PIC \
@@ -2763,6 +2762,9 @@ NXBMAKEARGS+= \
 	MK_WERROR=no \
 	MK_ZFS=no
 
+NXBMAKEENV+= \
+	MAKEOBJDIRPREFIX=
+
 .if make(native-xtools*) && \
     (!defined(NXB_TARGET) || !defined(NXB_TARGET_ARCH))
 .error Missing NXB_TARGET / NXB_TARGET_ARCH