diff --git a/src/matrix/storage/idb/QueryTarget.ts b/src/matrix/storage/idb/QueryTarget.ts
index 97b85569..f27123d5 100644
--- a/src/matrix/storage/idb/QueryTarget.ts
+++ b/src/matrix/storage/idb/QueryTarget.ts
@@ -37,6 +37,7 @@ interface QueryTargetInterface<T> {
     openKeyCursor(range?: IDBQuery, direction?: IDBCursorDirection | undefined): IDBRequest<IDBCursor | null>;
     supports(method: string): boolean;
     keyPath: string | string[];
+    count(keyRange?: IDBKeyRange): IDBRequest<number>;
     get(key: IDBValidKey | IDBKeyRange): IDBRequest<T | undefined>;
     getKey(key: IDBValidKey | IDBKeyRange): IDBRequest<IDBValidKey | undefined>;
 }
@@ -78,6 +79,10 @@ export class QueryTarget<T> {
         return this._target.supports(methodName);
     }
 
+    count(keyRange?: IDBKeyRange): Promise<number> {
+        return reqAsPromise(this._target.count(keyRange));
+    }
+
     get(key: IDBValidKey | IDBKeyRange): Promise<T | undefined> {
         return reqAsPromise(this._target.get(key));
     }
diff --git a/src/matrix/storage/idb/Store.ts b/src/matrix/storage/idb/Store.ts
index f45b3f3e..20e6f79a 100644
--- a/src/matrix/storage/idb/Store.ts
+++ b/src/matrix/storage/idb/Store.ts
@@ -118,6 +118,14 @@ export class QueryTargetWrapper<T> {
         }
     }
 
+    count(keyRange?: IDBKeyRange): IDBRequest<number> {
+        try {
+            return this._qtStore.count(keyRange);
+        } catch(err) {
+            throw new IDBRequestAttemptError("count", this._qt, err, [keyRange]);
+        }
+    }
+
     index(name: string): IDBIndex {
         try {
             return this._qtStore.index(name);