diff --git a/extras/ai-battle/HeadlessGame.cpp b/extras/ai-battle/HeadlessGame.cpp
index 1bdd33a5e..ec1d8f020 100644
--- a/extras/ai-battle/HeadlessGame.cpp
+++ b/extras/ai-battle/HeadlessGame.cpp
@@ -31,8 +31,9 @@ using bfs::canonical;
 
 #ifdef WIN32
 HANDLE setupStdOut();
-void printConsole(const char* fmt, ...);
-#elif defined(__GNUC__)
+#endif
+
+#ifdef __GNUC__
 void printConsole(const char* fmt, ...) __attribute__((format(printf, 1, 2)));
 #else
 void printConsole(const char* fmt, ...);