diff --git a/source/threejs/threeconverter.js b/source/threejs/threeconverter.js
index 0ad92d3..4a9b328 100644
--- a/source/threejs/threeconverter.js
+++ b/source/threejs/threeconverter.js
@@ -302,7 +302,7 @@ OV.ConvertModelToThreeObject = function (model, params, output, callbacks)
 				OV.RunTasksBatch (node.MeshIndexCount (), 100, {
 					runTask : (firstNodeMeshIndex, lastNodeMeshIndex, ready) => {
 						for (let nodeMeshIndex = firstNodeMeshIndex; nodeMeshIndex <= lastNodeMeshIndex; nodeMeshIndex++) {
-							let meshInstanceId = new OV.MeshInstanceId (node.GetId (), node.GetMeshIndex (lastNodeMeshIndex));
+							let meshInstanceId = new OV.MeshInstanceId (node.GetId (), node.GetMeshIndex (nodeMeshIndex));
 							ConvertMesh (threeNode, model, meshInstanceId, modelThreeMaterials);
 						}
 						ready ();