diff --git a/include/ntapi/nt_abi.h b/include/ntapi/nt_abi.h
index de99106..95fc9bf 100644
--- a/include/ntapi/nt_abi.h
+++ b/include/ntapi/nt_abi.h
@@ -14,15 +14,40 @@
 
 #ifndef __in
 #define __in
+#endif
+
+#ifndef __out
 #define __out
+#endif
+
+#ifndef __in_opt
 #define __in_opt
+#endif
+
+#ifndef __out_opt
 #define __out_opt
+#endif
+
+#ifndef __in_out
 #define __in_out
+#endif
+
+#ifndef __in_out_opt
 #define __in_out_opt
+#endif
+
+#ifndef __optional
 #define __optional
+#endif
+
+#ifndef __reserved
 #define __reserved
 #endif
 
+#ifndef __inline__
+#define __inline__     __inline
+#endif
+
 typedef unsigned short wchar16_t;
 typedef unsigned int   wchar32_t;
 
diff --git a/include/ntapi/nt_compiler.h b/include/ntapi/nt_compiler.h
index bb4b31d..0336330 100644
--- a/include/ntapi/nt_compiler.h
+++ b/include/ntapi/nt_compiler.h
@@ -31,6 +31,9 @@
 #define __attr_import__             __declspec(dllimport)
 #endif
 
+#ifndef _DALIST_FREESTANDING
+#define _DALIST_FREESTANDING
+#endif
 /* visual studio: end */
 
 #else