diff --git a/sdk/include/xdk/ntbasedef.h b/sdk/include/xdk/ntbasedef.h
index a662f2bdfb2..c0f10eeca16 100644
--- a/sdk/include/xdk/ntbasedef.h
+++ b/sdk/include/xdk/ntbasedef.h
@@ -173,7 +173,11 @@
  #endif
 #endif /* DECLSPEC_EXPORT */
 
+#ifdef __GNUC__
+#define DECLSPEC_NORETURN __attribute__((noreturn))
+#else
 #define DECLSPEC_NORETURN __declspec(noreturn)
+#endif
 
 #ifndef DECLSPEC_ADDRSAFE
  #if defined(_MSC_VER) && (defined(_M_ALPHA) || defined(_M_AXP64))
diff --git a/sdk/include/xdk/winnt_old.h b/sdk/include/xdk/winnt_old.h
index 569e9e10fc1..f2f3368925b 100644
--- a/sdk/include/xdk/winnt_old.h
+++ b/sdk/include/xdk/winnt_old.h
@@ -79,9 +79,9 @@
 
 /*#ifdef _WINE*/
 #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
-# define __WINE_ALLOC_SIZE(x) __attribute__((__alloc_size__(x)))
+# define __WINE_ALLOC_SIZE(...) __attribute__((__alloc_size__(__VA_ARGS__)))
 #else
-# define __WINE_ALLOC_SIZE(x)
+# define __WINE_ALLOC_SIZE(...)
 #endif
 /*#endif*/