--- a/src/water.h	Thu Jan 17 16:55:13 2008 +0000
+++ b/src/water.h	Thu Jan 17 17:13:47 2008 +0000
@@ -10,6 +10,6 @@
 void DrawCanalWater(TileIndex tile);
 void MakeWaterOrCanalDependingOnOwner(TileIndex tile, Owner o);
 void MakeWaterOrCanalDependingOnSurroundings(TileIndex t, Owner o);
-void FloodHalftile(TileIndex t);
+bool FloodHalftile(TileIndex t);
 
 #endif /* WATER_H */