diff --git a/comms/tkhylafax/Makefile b/comms/tkhylafax/Makefile
index a73b0c820b7..5f8728ba667 100644
--- a/comms/tkhylafax/Makefile
+++ b/comms/tkhylafax/Makefile
@@ -19,6 +19,8 @@ RUN_DEPENDS=	comms/hylafax \
 
 NO_TEST=	Yes
 
+SUBST_VARS=	MODTCL_BIN MODTK_BIN
+
 pre-configure:
 	${SUBST_CMD} ${WRKSRC}/Makefile \
 		${WRKSRC}/tkhylafax-defaults ${WRKSRC}/tkhylafax.man