diff --git a/lib/modules/firestore/index.js b/lib/modules/firestore/index.js
index 8d463a20..1ffd11c9 100644
--- a/lib/modules/firestore/index.js
+++ b/lib/modules/firestore/index.js
@@ -101,7 +101,7 @@ export default class Firestore extends FirestoreInternalModule {
    * @returns {CollectionReference}
    */
   collection(collectionPath: string): CollectionReference {
-    const path = super._referencePath.child(collectionPath);
+    const path = this._referencePath.child(collectionPath);
     if (!path.isCollection) {
       throw new Error('Argument "collectionPath" must point to a collection.');
     }
@@ -115,7 +115,7 @@ export default class Firestore extends FirestoreInternalModule {
    * @returns {DocumentReference}
    */
   doc(documentPath: string): DocumentReference {
-    const path = super._referencePath.child(documentPath);
+    const path = this._referencePath.child(documentPath);
     if (!path.isDocument) {
       throw new Error('Argument "documentPath" must point to a document.');
     }