diff --git a/bacnet-stack/demo/writefile/makefile.mak b/bacnet-stack/demo/writefile/makefile.b32
similarity index 98%
rename from bacnet-stack/demo/writefile/makefile.mak
rename to bacnet-stack/demo/writefile/makefile.b32
index c8fa16ed..dd8420de 100644
--- a/bacnet-stack/demo/writefile/makefile.mak
+++ b/bacnet-stack/demo/writefile/makefile.b32
@@ -15,7 +15,7 @@ PRODUCT = bacawf
 PRODUCT_EXE = $(PRODUCT).exe
 
 # Choose the Data Link Layer to Enable
-DEFINES = -DBACDL_BIP=1
+DEFINES = -DBACDL_BIP=1;TSM_ENABLED=1
 
 SRCS = writefile.c \
        ..\..\ports\win32\bip-init.c \