diff --git a/reactos/include/ndk/asm.h b/reactos/include/ndk/asm.h
index 9a7c13245e0..134967f16e0 100644
--- a/reactos/include/ndk/asm.h
+++ b/reactos/include/ndk/asm.h
@@ -291,7 +291,9 @@ Author:
 #define EFLAGS_VIP                              0x100000
 #define EFLAG_SIGN                              0x8000
 #define EFLAG_ZERO                              0x4000
-#define EFLAG_SELECT                            (EFLAG_SIGN | EFLAG_ZERO)
+#ifndef EFLAG_SELECT
+#define EFLAG_SELECT                            (EFLAG_SIGN + EFLAG_ZERO)
+#endif
 
 //
 // CR0
diff --git a/reactos/include/ndk/extypes.h b/reactos/include/ndk/extypes.h
index 92203e93f7f..19d685c13e8 100644
--- a/reactos/include/ndk/extypes.h
+++ b/reactos/include/ndk/extypes.h
@@ -354,7 +354,7 @@ typedef struct _EX_PUSH_LOCK_WAIT_BLOCK
     LONG ShareCount;
     LONG Flags;
 #if DBG
-    BOOL Signaled;
+    BOOLEAN Signaled;
     EX_PUSH_LOCK NewValue;
     EX_PUSH_LOCK OldValue;
     PEX_PUSH_LOCK PushLock;