diff --git a/glide3x/Makefile.win32 b/glide3x/Makefile.win32
index fd1ffff..47be2a5 100644
--- a/glide3x/Makefile.win32
+++ b/glide3x/Makefile.win32
@@ -304,18 +304,18 @@ LINK = link
 AR   = lib
 AS   = nasmw
 
-CFLAGS  = -G6 -W3 -WX -c -D__MSC__=1 -D_X86_=1 -DNULL=0 -D_WIN32=1 -DWIN32=1 -D__WIN32__=1 -DSTRICT
+CFLAGS  = -G6 -W3 -WX -c -D__MSC__=1 -D_X86_=1 -DNULL=0 -D_WIN32=1 -DWIN32=1 -D__WIN32__=1 -DSTRICT -D_WINDOWS
 LFLAGS  = -nologo /DLL /OPT:WIN98 /MACHINE:IX86 /NODEFAULTLIB
 ARFLAGS = -nologo
 ASFLAGS = -O6 -fwin32 -D__WIN32__ --prefix _
 
 !if "$(DEBUG)"== "1"
-CFLAGS  = $(CFLAGS) -Od -MDd -DDEBUG=1 -D_DEBUG -D_MT -D_DLL -Zi
+CFLAGS  = $(CFLAGS) -Od -DDEBUG=1 -D_DEBUG -MTd -D_USRDLL -Zi
 LFLAGS  = $(LFLAGS) -debugtype:both /DEBUG
 ARFLAGS = $(ARFLAGS) -debugtype:both
 ASFLAGS = $(ASFLAGS) -g -DDEBUG=1
 !else
-CFLAGS  = $(CFLAGS) -Ox -MD -D_MT -D_DLL
+CFLAGS  = $(CFLAGS) -O2 -MT -D_USRDLL -DNDEBUG
 !endif
 
 # So that we can get reasonable stuff from SoftIce etc even