diff --git a/src/debug.h b/src/debug.h
--- a/src/debug.h
+++ b/src/debug.h
@@ -19,44 +19,14 @@
  * 6.. - extremely detailed spamming
  */
 
-/* Of course MSVC 2003 and lower has no support for variadic macros
- * so we need to work around this... *sigh* */
-#if defined(_MSC_VER) && (_MSC_VER < 1400)
-	#define NO_VARARG_MACRO
-#endif
-
-#if defined(NO_VARARG_MACRO)
-	enum DebugLevelType {
-		ai,
-		driver,
-		grf,
-		map,
-		misc,
-		ms,
-		net,
-		sprite,
-		oldloader,
-		ntp,
-		npf,
-		yapf,
-		freetype,
-		sl,
-		station,
-	};
-#endif /* NO_VARARG_MACRO */
-
 #ifdef NO_DEBUG_MESSAGES
-	#if defined(NO_VARARG_MACRO)
-		static inline void DEBUG(int name, int level, ...) {}
-	#elif defined(__GNUC__) && (__GNUC__ < 3)
+	#if defined(__GNUC__) && (__GNUC__ < 3)
 		#define DEBUG(name, level, args...)
 	#else
 		#define DEBUG(name, level, ...)
 	#endif
 #else /* NO_DEBUG_MESSAGES */
-	#if defined(NO_VARARG_MACRO)
-		void CDECL DEBUG(int name, int level, ...);
-	#elif defined(__GNUC__) && (__GNUC__ < 3)
+	#if defined(__GNUC__) && (__GNUC__ < 3)
 		#define DEBUG(name, level, args...) if ((level == 0) || ( _debug_ ## name ## _level >= level)) debug(#name, args)
 	#else
 		#define DEBUG(name, level, ...) if (level == 0 || _debug_ ## name ## _level >= level) debug(#name, __VA_ARGS__)
@@ -78,9 +48,7 @@
 	extern int _debug_sl_level;
 	extern int _debug_station_level;
 
-	#if !defined(NO_VARARG_MACRO)
-		void CDECL debug(const char *dbg, ...);
-	#endif /* NO_VARARG_MACRO */
+	void CDECL debug(const char *dbg, ...);
 #endif /* NO_DEBUG_MESSAGES */
 
 void SetDebugString(const char *s);