Index: src/town_cmd.cpp
===================================================================
--- src/town_cmd.cpp	(revision 27383)
+++ src/town_cmd.cpp	(working copy)
@@ -1379,12 +1379,14 @@
 		/* Try to grow the town from this point */
 		GrowTownInTile(&tile, cur_rb, target_dir, t);
 
+		if (_grow_town_result == GROWTH_SUCCEED) {
+			return true;
+		}
+
 		/* Exclude the source position from the bitmask
 		 * and return if no more road blocks available */
 		if (IsValidDiagDirection(target_dir)) cur_rb &= ~DiagDirToRoadBits(ReverseDiagDir(target_dir));
-		if (cur_rb == ROAD_NONE) {
-			return _grow_town_result == GROWTH_SUCCEED;
-		}
+		if (cur_rb == ROAD_NONE) return false;
 
 		if (IsTileType(tile, MP_TUNNELBRIDGE)) {
 			/* Only build in the direction away from the tunnel or bridge. */
@@ -1419,7 +1421,7 @@
 		/* Max number of times is checked. */
 	} while (--_grow_town_result >= 0);
 
-	return _grow_town_result == GROWTH_SUCCEED - 1;
+	return false;
 }
 
 /**