diff --git a/reactos/sdk/include/psdk/reason.h b/reactos/sdk/include/psdk/reason.h
index 0459cb4cb43..1c27bf25b1a 100644
--- a/reactos/sdk/include/psdk/reason.h
+++ b/reactos/sdk/include/psdk/reason.h
@@ -43,6 +43,6 @@
 #define SHTDN_REASON_FLAG_USER_DEFINED           0x40000000
 #define SHTDN_REASON_FLAG_PLANNED                0x80000000
 
-#endif /* WIN32_WINNT >= 0x0501 */
+#endif /* _WIN32_WINNT >= 0x0501 */
 
 #endif /* _REASON_H */
diff --git a/reactos/sdk/include/psdk/sdkddkver.h b/reactos/sdk/include/psdk/sdkddkver.h
index 26a9a7047fd..7ffd7dc89ea 100644
--- a/reactos/sdk/include/psdk/sdkddkver.h
+++ b/reactos/sdk/include/psdk/sdkddkver.h
@@ -128,7 +128,7 @@ Abstract:
 #define NTDDI_VERSION_FROM_WIN32_WINNT2(Version) Version##0000
 #define NTDDI_VERSION_FROM_WIN32_WINNT(Version)  NTDDI_VERSION_FROM_WIN32_WINNT2(Version)
 
-/* Select Default WIN32_WINNT Value */
+/* Select Default _WIN32_WINNT Value */
 #if !defined(_WIN32_WINNT) && !defined(_CHICAGO_)
 #define _WIN32_WINNT    0x0600
 #endif
diff --git a/reactos/sdk/include/reactos/idl/pnp.idl b/reactos/sdk/include/reactos/idl/pnp.idl
index 508c599fc21..b166551d1a8 100644
--- a/reactos/sdk/include/reactos/idl/pnp.idl
+++ b/reactos/sdk/include/reactos/idl/pnp.idl
@@ -925,6 +925,6 @@ cpp_quote("#if _WIN32_WINNT >= 0x0501")
         [out] DWORD *pulSSDIFlags,
         [in] DWORD ulFlags);
 
-cpp_quote("#endif /* WIN32_WINNT >= 0x0501 */")
+cpp_quote("#endif /* _WIN32_WINNT >= 0x0501 */")
 
 }
diff --git a/reactos/sdk/include/xdk/winnt_old.h b/reactos/sdk/include/xdk/winnt_old.h
index f88b6cc8970..13262bc8f4e 100644
--- a/reactos/sdk/include/xdk/winnt_old.h
+++ b/reactos/sdk/include/xdk/winnt_old.h
@@ -3805,7 +3805,7 @@ typedef enum _POWER_INFORMATION_LEVEL {
   PowerInformationLevelMaximum
 } POWER_INFORMATION_LEVEL;
 
-#if 1 /* (WIN32_WINNT >= 0x0500) */
+#if 1 /* (_WIN32_WINNT >= 0x0500) */
 typedef struct _SYSTEM_POWER_INFORMATION {
     ULONG  MaxIdlenessAllowed;
     ULONG  Idleness;
@@ -3899,7 +3899,7 @@ typedef const ASSEMBLY_FILE_DETAILED_INFORMATION *PCASSEMBLY_FILE_DETAILED_INFOR
 #define ACTIVATION_CONTEXT_SECTION_GLOBAL_OBJECT_RENAME_TABLE    8
 #define ACTIVATION_CONTEXT_SECTION_CLR_SURROGATES                9
 
-#endif /* (WIN32_WINNT >= 0x0501) */
+#endif /* (_WIN32_WINNT >= 0x0501) */
 
 typedef struct _PROCESSOR_POWER_POLICY_INFO {
   DWORD TimeCheck;