diff --git a/share/mk/bsd.compat.mk b/share/mk/bsd.compat.mk
index 9b3d2c2d22eb..d7d63bfe55db 100644
--- a/share/mk/bsd.compat.mk
+++ b/share/mk/bsd.compat.mk
@@ -161,6 +161,7 @@ LIBCOMPATCFLAGS+=	-B${LIBCOMPATTMP}/usr/lib${libcompat}
 .if defined(WANT_COMPAT)
 LIBDIR_BASE:=	/usr/lib${libcompat}
 _LIB_OBJTOP=	${LIBCOMPAT_OBJTOP}
+LIBDESTDIR:=	${LIBCOMPATTMP}
 CFLAGS+=	${LIBCOMPATCFLAGS}
 LDFLAGS+=	${CFLAGS} ${LIBCOMPATLDFLAGS}
 MACHINE=	${LIBCOMPAT_MACHINE}
diff --git a/share/mk/bsd.libnames.mk b/share/mk/bsd.libnames.mk
index feb7f4c4070e..d030292d3c5e 100644
--- a/share/mk/bsd.libnames.mk
+++ b/share/mk/bsd.libnames.mk
@@ -8,7 +8,7 @@
 .error bsd.libnames.mk cannot be included directly.
 .endif
 
-LIBDESTDIR=	${SYSROOT:U${DESTDIR}}
+LIBDESTDIR?=	${SYSROOT:U${DESTDIR}}
 
 .sinclude <src.libnames.mk>