--- a/engine.h	Thu Jan 27 21:00:05 2005 +0000
+++ b/engine.h	Thu Jan 27 21:18:03 2005 +0000
@@ -133,7 +133,7 @@
 void LoadCustomEngineNames(void);
 void DeleteCustomEngineNames(void);
 
-bool IsEngineBuildable(int engine, byte type);
+bool IsEngineBuildable(uint engine, byte type);
 
 enum {
 	NUM_NORMAL_RAIL_ENGINES = 54,