diff --git a/src/xpdev/Makefile b/src/xpdev/Makefile
index 31f2e9a033ccbc4d028f98e55397b0b45aaef8ed..10b959a8bf497446a610919b30f36cfd755e013b 100644
--- a/src/xpdev/Makefile
+++ b/src/xpdev/Makefile
@@ -3,6 +3,9 @@
 SRC_ROOT	=	..
 !include $(SRC_ROOT)/build/Common.bmake
 
+CFLAGS	=	$(CFLAGS) $(XPDEV_CFLAGS)
+MT_CFLAGS	=	$(MT_CFLAGS) $(XPDEV-MT_CFLAGS)
+
 #The following is necessary only when DLL-exporting wrapper functions
 !ifdef DLLIBS
 CFLAGS	=	$(CFLAGS) -DWRAPPER_EXPORTS=1