diff --git a/project/extras.mk b/project/extras.mk
index 1eeb26e..7bb607f 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,7 +1,7 @@
 CFLAGS_SHARED_ATTR 	+= -DNTAPI_EXPORT
 CFLAGS_STATIC_ATTR 	+= -DNTAPI_STATIC
 
-CFLAGS_CONFIG 		+= -DMIDIPIX_FREESTANDING -D__NT$(HOST_BITS)
+CFLAGS_CONFIG 		+= -D_MIDIPIX_FREESTANDING -D__NT$(HOST_BITS)
 CFLAGS_CONFIG 		+= -UWIN32 -U_WIN32 -U__WIN32 -U__WIN32__
 CFLAGS_CONFIG 		+= -UWIN64 -U_WIN64 -U__WIN64 -U__WIN64__