diff -r 38fe72ff1402 -r 86e0352eb993 src/industry_cmd.cpp
--- a/src/industry_cmd.cpp	Thu Jan 31 17:46:08 2008 +0000
+++ b/src/industry_cmd.cpp	Thu Jan 31 17:54:13 2008 +0000
@@ -841,7 +841,7 @@
 {
 	switch (GetTileType(tile)) {
 		case MP_CLEAR: return IsClearGround(tile, CLEAR_FIELDS) || IsClearGround(tile, CLEAR_SNOW) || IsClearGround(tile, CLEAR_DESERT);
-		case MP_TREES: return false;
+		case MP_TREES: return (GetTreeGround(tile) == TREE_GROUND_SHORE);
 		default:       return true;
 	}
 }
@@ -850,7 +850,7 @@
 {
 	switch (GetTileType(tile)) {
 		case MP_CLEAR: return IsClearGround(tile, CLEAR_SNOW) || IsClearGround(tile, CLEAR_DESERT);
-		case MP_TREES: return false;
+		case MP_TREES: return (GetTreeGround(tile) == TREE_GROUND_SHORE);
 		default:       return true;
 	}
 }