diff --git a/bacnet-stack/lib/makefile.b32 b/bacnet-stack/lib/makefile.b32
index b83342ed..af99adfe 100644
--- a/bacnet-stack/lib/makefile.b32
+++ b/bacnet-stack/lib/makefile.b32
@@ -20,6 +20,7 @@ MAKE = $(BORLAND_DIR)\bin\make
 
 BACNET_DEFINES = -DPRINT_ENABLED=1 -DBACFILE -DBACAPP_ALL
 BACDL_DEFINE=-DBACDL_BIP=1 -DUSE_INADDR=1
+#BACDL_DEFINE=-DBACDL_MSTP=1
 DEFINES = $(BACNET_DEFINES) $(BACDL_DEFINE)
 
 # directories
@@ -127,6 +128,7 @@ PORT_SRC = $(BACNET_PORT)\bip-init.c \
 	$(BACNET_PORT)\dlmstp.c \
 	$(BACNET_CORE)\crc.c \
 	$(BACNET_CORE)\mstp.c \
+	$(BACNET_CORE)\mstptext.c \
 	$(BACNET_CORE)\bvlc.c \
 	$(BACNET_CORE)\bip.c