diff --git a/examples/jsm/loaders/GLTFLoader.js b/examples/jsm/loaders/GLTFLoader.js
index 8994da563eec28..916046a92927a1 100644
--- a/examples/jsm/loaders/GLTFLoader.js
+++ b/examples/jsm/loaders/GLTFLoader.js
@@ -578,6 +578,14 @@ class GLTFLightsExtension {
 
 	}
 
+	getDependency( type, index ) {	
+
+		if ( type !== 'light' ) return;
+
+		return this._loadLight( index );
+
+	}
+
 	createNodeAttachment( nodeIndex ) {
 
 		const self = this;
@@ -2751,7 +2759,19 @@ class GLTFParser {
 					break;
 
 				default:
-					throw new Error( 'Unknown type: ' + type );
+					dependency = this._invokeOne( function ( ext ) {
+
+						return ext != this && ext.getDependency && ext.getDependency( type, index );
+
+					} );
+
+					if ( ! dependency ) {
+
+						throw new Error( 'Unknown type: ' + type );
+
+					}
+
+					break;
 
 			}