diff --git a/ai/ai.c b/ai/ai.c
index 6779528e2f..f9dc01daaf 100644
--- a/ai/ai.c
+++ b/ai/ai.c
@@ -6,6 +6,7 @@
 #include "../command.h"
 #include "../network.h"
 #include "ai.h"
+#include "default/default.h"
 
 /**
  * Dequeues commands put in the queue via AI_PutCommandInQueue.
diff --git a/ai/default/default.c b/ai/default/default.c
index 0fb4a38179..8257b00260 100644
--- a/ai/default/default.c
+++ b/ai/default/default.c
@@ -17,6 +17,7 @@
 #include "../../airport.h"
 #include "../../depot.h"
 #include "../../variables.h"
+#include "default.h"
 
 // remove some day perhaps?
 static Player *_cur_ai_player;
diff --git a/ai/default/default.h b/ai/default/default.h
new file mode 100644
index 0000000000..d367d4a72c
--- /dev/null
+++ b/ai/default/default.h
@@ -0,0 +1,8 @@
+/* $Id$ */
+
+#ifndef DEFAULT_H
+#define DEFAULT_H
+
+void AiDoGameLoop(Player*);
+
+#endif
diff --git a/player.h b/player.h
index 001b43f7c0..645cb31ade 100644
--- a/player.h
+++ b/player.h
@@ -197,7 +197,6 @@ void ChangeOwnershipOfPlayerItems(PlayerID old_player, PlayerID new_player);
 void GetNameOfOwner(PlayerID owner, TileIndex tile);
 int64 CalculateCompanyValue(Player *p);
 void InvalidatePlayerWindows(Player *p);
-void AiDoGameLoop(Player *p);
 void UpdatePlayerMoney32(Player *p);
 #define FOR_ALL_PLAYERS(p) for(p=_players; p != endof(_players); p++)