diff --git a/src/compat/firestore/collection-group/collection-group.ts b/src/compat/firestore/collection-group/collection-group.ts
index 06162ed13..b7354753f 100644
--- a/src/compat/firestore/collection-group/collection-group.ts
+++ b/src/compat/firestore/collection-group/collection-group.ts
@@ -83,7 +83,7 @@ export class AngularFirestoreCollectionGroup<T = DocumentData> {
    */
   valueChanges(): Observable<T[]>;
   // tslint:disable-next-line:unified-signatures
-  valueChanges({}): Observable<T[]>;
+  valueChanges(): Observable<T[]>;
   valueChanges<K extends string>(options: {idField: K}): Observable<(T & { [T in K]: string })[]>;
   valueChanges<K extends string>(options: {idField?: K} = {}): Observable<T[]> {
     const fromCollectionRefScheduled$ = fromCollectionRef<T>(this.query, this.afs.schedulers.outsideAngular);
diff --git a/src/compat/firestore/collection/collection.ts b/src/compat/firestore/collection/collection.ts
index f873441ad..26c93e3db 100644
--- a/src/compat/firestore/collection/collection.ts
+++ b/src/compat/firestore/collection/collection.ts
@@ -105,7 +105,7 @@ export class AngularFirestoreCollection<T = DocumentData> {
    */
   valueChanges(): Observable<T[]>;
   // tslint:disable-next-line:unified-signatures
-  valueChanges({}): Observable<T[]>;
+  valueChanges(): Observable<T[]>;
   valueChanges<K extends string>(options: {idField: K}): Observable<(T & { [T in K]: string })[]>;
   valueChanges<K extends string>(options: {idField?: K} = {}): Observable<T[]> {
     return fromCollectionRef<T>(this.query, this.afs.schedulers.outsideAngular)