diff --git a/include/tile_data.h b/include/tile_data.h
index 32e892d3..3135643e 100644
--- a/include/tile_data.h
+++ b/include/tile_data.h
@@ -453,6 +453,7 @@ class TileDataSource {
 
 	virtual void populateMultiPolygon(MultiPolygon& dst, NodeID objectID);
 
+	unsigned int getIndexZoom() const { return indexZoom; }
 	inline size_t getId(NodeID id) const {
 		return id & (~(~0ull << (TILE_DATA_ID_SIZE - shardBits)));
 	}
diff --git a/src/osm_lua_processing.cpp b/src/osm_lua_processing.cpp
index f368baa4..545b1f37 100644
--- a/src/osm_lua_processing.cpp
+++ b/src/osm_lua_processing.cpp
@@ -972,7 +972,7 @@ bool OsmLuaProcessing::setNode(NodeID id, LatpLon node, const TagMap& tags) {
 	}
 
 	if (!this->empty()) {
-		TileCoordinates index = latpLon2index(node, this->config.baseZoom);
+		TileCoordinates index = latpLon2index(node, osmMemTiles.getIndexZoom());
 
 		for (auto &output : finalizeOutputs()) {
 			osmMemTiles.addObjectToSmallIndex(index, output, originalOsmID);