--- a/src/unmovable_map.h	Thu Jan 11 13:41:16 2007 +0000
+++ b/src/unmovable_map.h	Mon Jan 15 20:14:06 2007 +0000
@@ -26,7 +26,7 @@
 static inline UnmovableType GetUnmovableType(TileIndex t)
 {
 	assert(IsTileType(t, MP_UNMOVABLE));
-	return _m[t].m5;
+	return (UnmovableType)_m[t].m5;
 }