diff --git a/cddl/lib/Makefile b/cddl/lib/Makefile
index 33cda45cbaf9..17ef47449269 100644
--- a/cddl/lib/Makefile
+++ b/cddl/lib/Makefile
@@ -2,7 +2,7 @@
 
 .include <bsd.own.mk>
 
-SUBDIR=	drti \
+SUBDIR=	${_drti} \
 	libavl \
 	libctf \
 	${_libdtrace} \
@@ -20,6 +20,7 @@ _libzpool=	libzpool
 .endif
 
 .if ${MACHINE_ARCH} == amd64 || ${MACHINE_ARCH} == i386
+_drti=		drti
 _libdtrace=	libdtrace
 .endif