diff --git a/command.c b/command.c
--- a/command.c
+++ b/command.c
@@ -321,8 +321,6 @@ int32 DoCommandByTile(TileIndex tile, ui
 }
 
 
-//extern void _stdcall Sleep(int s);
-
 int32 DoCommand(int x, int y, uint32 p1, uint32 p2, uint32 flags, uint procc)
 {
 	int32 res;