diff --git a/src/providers/database.ts b/src/providers/database.ts
index e648be20e..78614a152 100644
--- a/src/providers/database.ts
+++ b/src/providers/database.ts
@@ -476,7 +476,7 @@ export class DataSnapshot {
    * @return `true` if enumeration was canceled due to your callback
    *   returning `true`.
    */
-  forEach(action: (a: DataSnapshot) => boolean): boolean {
+  forEach(action: (a: DataSnapshot) => boolean | void): boolean {
     const val = this.val();
     if (_.isPlainObject(val)) {
       return _.some(