diff --git a/Makefile.inc1 b/Makefile.inc1
index a9f9c064d85a..5a8977e71970 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -395,7 +395,8 @@ LIB32WMAKEENV+=	MAKEOBJDIRPREFIX=${OBJTREE}/lib32 \
 		PATH=${TMPPATH} \
 		LIBDIR=/usr/lib32 \
 		SHLIBDIR=/usr/lib32 \
-		LIBPRIVATEDIR=/usr/lib32/private
+		LIBPRIVATEDIR=/usr/lib32/private \
+		DTRACE="${DTRACE} -32"
 LIB32WMAKEFLAGS+= CC="${XCC} ${LIB32FLAGS}" \
 		CXX="${XCXX} ${LIB32FLAGS}" \
 		DESTDIR=${LIB32TMP} \