diff --git a/src/saveload/town_sl.cpp b/src/saveload/town_sl.cpp
index e09bf9d444..dce806121e 100644
--- a/src/saveload/town_sl.cpp
+++ b/src/saveload/town_sl.cpp
@@ -44,7 +44,7 @@ void RebuildTownCaches()
 		if (IsHouseCompleted(t)) town->cache.population += HouseSpec::Get(house_id)->population;
 
 		/* Increase the number of houses for every house, but only once. */
-		if (GetHouseNorthPart(house_id) == 0) town->cache.num_houses++;
+		if (GetHouseNorthPart(house_id) == TileDiffXY(0, 0)) town->cache.num_houses++;
 	}
 
 	/* Update the population and num_house dependent values */
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index a2dd019251..a81522a362 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -2934,7 +2934,7 @@ TileIndexDiff GetHouseNorthPart(HouseID &house)
 			return TileDiffXY(-1, -1);
 		}
 	}
-	return 0;
+	return TileDiffXY(0, 0);
 }
 
 /**