diff --git a/reactos/w32api/include/ddk/afilter.h b/reactos/w32api/include/ddk/afilter.h
index 1c631c9ea5d..d8e457289ae 100644
--- a/reactos/w32api/include/ddk/afilter.h
+++ b/reactos/w32api/include/ddk/afilter.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __AFILTER_H
-#define __AFILTER_H
+#ifndef _ARC_FILTER_DEFS_
+#define _ARC_FILTER_DEFS_
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -186,4 +186,4 @@ ArcDestroyPacket(
 }
 #endif
 
-#endif /* __AFILTER_H */
+#endif /* _ARC_FILTER_DEFS_ */
diff --git a/reactos/w32api/include/ddk/atm.h b/reactos/w32api/include/ddk/atm.h
index 234ac444b9b..a5423e5c04c 100644
--- a/reactos/w32api/include/ddk/atm.h
+++ b/reactos/w32api/include/ddk/atm.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __ATM_H
-#define __ATM_H
+#ifndef _ATM_H
+#define _ATM_H
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -504,4 +504,4 @@ typedef struct _ATM_SERVICE_ADDRESS_LIST {
 }
 #endif
 
-#endif /* __ATM_H */
+#endif /* _ATM_H */
diff --git a/reactos/w32api/include/ddk/cfg.h b/reactos/w32api/include/ddk/cfg.h
index adb6144874f..37e8fe64ae9 100644
--- a/reactos/w32api/include/ddk/cfg.h
+++ b/reactos/w32api/include/ddk/cfg.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __CFG_H
-#define __CFG_H
+#ifndef _CFG_INCLUDED_
+#define _CFG_INCLUDED_
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -142,4 +142,4 @@ typedef enum _PNP_VETO_TYPE {
 }
 #endif
 
-#endif /* __CFG_H */
+#endif /* _CFG_INCLUDED_ */
diff --git a/reactos/w32api/include/ddk/cfgmgr32.h b/reactos/w32api/include/ddk/cfgmgr32.h
index 173f7ebc464..01a0e141405 100644
--- a/reactos/w32api/include/ddk/cfgmgr32.h
+++ b/reactos/w32api/include/ddk/cfgmgr32.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __CFGMGR32_H
-#define __CFGMGR32_H
+#ifndef _CFGMGR32_H_
+#define _CFGMGR32_H_
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -1876,4 +1876,4 @@ CMP_WaitNoPendingInstallEvents(
 }
 #endif
 
-#endif /* __CFGMGR32_H */
+#endif /* _CFGMGR32_H_ */
diff --git a/reactos/w32api/include/ddk/d3dhal.h b/reactos/w32api/include/ddk/d3dhal.h
index 2c0a4393ba7..867901ae339 100644
--- a/reactos/w32api/include/ddk/d3dhal.h
+++ b/reactos/w32api/include/ddk/d3dhal.h
@@ -19,8 +19,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef __WINE_D3DHAL_H
-#define __WINE_D3DHAL_H
+#ifndef _D3DHAL_H_
+#define _D3DHAL_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -522,4 +522,4 @@ typedef struct _D3DHAL_DP2SETTEXLOD {
 } /* extern "C" */
 #endif
 
-#endif /* __WINE_DDRAWI_H */
+#endif /* _D3DHAL_H_ */
diff --git a/reactos/w32api/include/ddk/scsi.h b/reactos/w32api/include/ddk/scsi.h
index 2f1db7b3fbd..640ae9e58b8 100644
--- a/reactos/w32api/include/ddk/scsi.h
+++ b/reactos/w32api/include/ddk/scsi.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __SCSI_H
-#define __SCSI_H
+#ifndef _NTSCSI_
+#define _NTSCSI_
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -1692,4 +1692,4 @@ typedef union _TWO_BYTE {
 }
 #endif
 
-#endif /* __SCSI_H */
+#endif /* _NTSCSI_ */
diff --git a/reactos/w32api/include/ddk/xfilter.h b/reactos/w32api/include/ddk/xfilter.h
index bd4115a2d31..2f322f0d05f 100644
--- a/reactos/w32api/include/ddk/xfilter.h
+++ b/reactos/w32api/include/ddk/xfilter.h
@@ -20,8 +20,8 @@
  *
  */
 
-#ifndef __XFILTER_H
-#define __XFILTER_H
+#ifndef _X_FILTER_DEFS_
+#define _X_FILTER_DEFS_
 
 #if __GNUC__ >=3
 #pragma GCC system_header
@@ -233,4 +233,4 @@ typedef ULONG TR_GROUP_ADDRESS;
 }
 #endif
 
-#endif /* __XFILTER_H */
+#endif /* _X_FILTER_DEFS_ */