diff --git a/plugins/USBqemu/USB.h b/plugins/USBqemu/USB.h
index b190d94996..3404a8196c 100644
--- a/plugins/USBqemu/USB.h
+++ b/plugins/USBqemu/USB.h
@@ -26,7 +26,7 @@
 #define USBdefs
 #include "PS2Edefs.h"
 
-#ifdef __WIN32__
+#ifdef _WIN32
 #	include <windows.h>
 #	include <windowsx.h>
 #else
diff --git a/plugins/dev9ghzdrk/DEV9.cpp b/plugins/dev9ghzdrk/DEV9.cpp
index 9ae3356dab..e4b83c0b18 100644
--- a/plugins/dev9ghzdrk/DEV9.cpp
+++ b/plugins/dev9ghzdrk/DEV9.cpp
@@ -32,7 +32,7 @@
 #include "smap.h"
 #include "ata.h"
 
-#ifdef __WIN32__
+#ifdef _WIN32
 #pragma warning(disable:4244)
 
 HINSTANCE hInst=NULL;
diff --git a/plugins/dev9ghzdrk/DEV9.h b/plugins/dev9ghzdrk/DEV9.h
index d9ca01192b..72a3eafc35 100644
--- a/plugins/dev9ghzdrk/DEV9.h
+++ b/plugins/dev9ghzdrk/DEV9.h
@@ -29,7 +29,7 @@
 #include "PS2Eext.h"
 #include "net.h"
 
-#ifdef __WIN32__
+#ifdef _WIN32
 
 #define usleep(x)	Sleep(x / 1000)
 #include <windows.h>
diff --git a/plugins/dev9ghzdrk/PS2Edefs.h b/plugins/dev9ghzdrk/PS2Edefs.h
index 20b2d64136..88abb0284b 100644
--- a/plugins/dev9ghzdrk/PS2Edefs.h
+++ b/plugins/dev9ghzdrk/PS2Edefs.h
@@ -30,7 +30,7 @@
 
  * OSflags:
 	__linux__ (linux OS)
-	__WIN32__ (win32 OS)
+	_WIN32 (win32 OS)
 
  * common return values (for ie. GSinit):
 	 0 - success
@@ -170,7 +170,7 @@ typedef struct {
 	void *common;
 } GSdriverInfo;
 
-#ifdef __WIN32__
+#ifdef _WIN32
 typedef struct { // unsupported values must be set to zero
 	HWND hWnd;
 	HMENU hMenu;
@@ -208,7 +208,7 @@ void CALLBACK GSmakeSnapshot(char *path);
 void CALLBACK GSirqCallback(void (*callback)());
 void CALLBACK GSprintf(int timeout, char *fmt, ...);
 void CALLBACK GSgetDriverInfo(GSdriverInfo *info);
-#ifdef __WIN32__
+#ifdef _WIN32
 s32  CALLBACK GSsetWindowInfo(winInfo *info);
 #endif
 s32  CALLBACK GSfreeze(int mode, freezeData *data);
@@ -425,7 +425,7 @@ typedef void (CALLBACK* _GSkeyEvent)(keyEvent* ev);
 typedef void (CALLBACK* _GSirqCallback)(void (*callback)());
 typedef void (CALLBACK* _GSprintf)(int timeout, char *fmt, ...);
 typedef void (CALLBACK* _GSgetDriverInfo)(GSdriverInfo *info);
-#ifdef __WIN32__
+#ifdef _WIN32
 typedef s32  (CALLBACK* _GSsetWindowInfo)(winInfo *info);
 #endif
 typedef void (CALLBACK* _GSmakeSnapshot)(char *path);
@@ -565,7 +565,7 @@ _GSmakeSnapshot	   GSmakeSnapshot;
 _GSirqCallback 	   GSirqCallback;
 _GSprintf      	   GSprintf;
 _GSgetDriverInfo   GSgetDriverInfo;
-#ifdef __WIN32__
+#ifdef _WIN32
 _GSsetWindowInfo   GSsetWindowInfo;
 #endif
 _GSfreeze          GSfreeze;
diff --git a/plugins/dev9ghzdrk/PS2Etypes.h b/plugins/dev9ghzdrk/PS2Etypes.h
index ffc801e2c1..dd3c10ff54 100644
--- a/plugins/dev9ghzdrk/PS2Etypes.h
+++ b/plugins/dev9ghzdrk/PS2Etypes.h
@@ -17,7 +17,7 @@
 #define __PS2ETYPES_H__
 
 // Basic types
-#if defined(__WIN32__)
+#if defined(_WIN32)
 
 typedef __int8  s8;
 typedef __int16 s16;