diff --git a/src/matrix/storage/idb/Store.ts b/src/matrix/storage/idb/Store.ts
index 17fb3762..82669753 100644
--- a/src/matrix/storage/idb/Store.ts
+++ b/src/matrix/storage/idb/Store.ts
@@ -89,7 +89,7 @@ class QueryTargetWrapper<T> {
         }
     }
 
-    get(key: IDBValidKey): IDBRequest<T> {
+    get(key: IDBValidKey): IDBRequest<T | null> {
         try {
             LOG_REQUESTS && logRequest("get", [key], this._qt);
             return this._qt.get(key);
diff --git a/src/matrix/storage/idb/stores/RoomSummaryStore.ts b/src/matrix/storage/idb/stores/RoomSummaryStore.ts
index bacefa5c..7b6ed600 100644
--- a/src/matrix/storage/idb/stores/RoomSummaryStore.ts
+++ b/src/matrix/storage/idb/stores/RoomSummaryStore.ts
@@ -38,24 +38,24 @@ export class RoomSummaryStore {
         this._summaryStore = summaryStore;
     }
 
-    getAll() {
+    getAll(): Promise<SummaryData[]> {
         return this._summaryStore.selectAll();
     }
 
-    set(summary: SummaryData) {
+    set(summary: SummaryData): void {
         return this._summaryStore.put(summary);
     }
 
-    get(roomId: string) {
+    get(roomId: string): Promise<SummaryData | null> {
         return this._summaryStore.get(roomId);
     }
 
-    async has(roomId: string) {
+    async has(roomId: string): Promise<boolean> {
         const fetchedKey = await this._summaryStore.getKey(roomId);
         return roomId === fetchedKey;
     }
 
-    remove(roomId: string) {
+    remove(roomId: string): void {
         return this._summaryStore.delete(roomId);
     }
 }
diff --git a/src/matrix/storage/idb/stores/SessionStore.ts b/src/matrix/storage/idb/stores/SessionStore.ts
index 4da63649..dd578d8c 100644
--- a/src/matrix/storage/idb/stores/SessionStore.ts
+++ b/src/matrix/storage/idb/stores/SessionStore.ts
@@ -22,7 +22,7 @@ export class SessionStore {
         this._sessionStore = sessionStore;
     }
 
-    async get(key: IDBValidKey) {
+    async get(key: IDBValidKey): Promise<any> {
         const entry = await this._sessionStore.get(key);
         if (entry) {
             return entry.value;