diff --git a/src/loaders/ObjectLoader.js b/src/loaders/ObjectLoader.js
index d0ef0856ee981a..348034a4a63b0c 100644
--- a/src/loaders/ObjectLoader.js
+++ b/src/loaders/ObjectLoader.js
@@ -965,7 +965,7 @@ class ObjectLoader extends Loader {
 
 				object = new InstancedMesh( geometry, material, count );
 				object.instanceMatrix = new BufferAttribute( new Float32Array( instanceMatrix.array ), 16 );
-				if ( instanceColor !== undefined ) object.instanceColor = new BufferAttribute( new Float32Array( instanceColor.array ), 3 );
+				if ( instanceColor !== undefined ) object.instanceColor = new BufferAttribute( new Float32Array( instanceColor.array ), instanceColor.itemSize );
 
 				break;