diff --git a/src/matrix/Session.js b/src/matrix/Session.js
index 6929430f..1e3f8382 100644
--- a/src/matrix/Session.js
+++ b/src/matrix/Session.js
@@ -21,6 +21,7 @@ import {User} from "./User.js";
 import {Account as E2EEAccount} from "./e2ee/Account.js";
 import {DeviceMessageHandler} from "./DeviceMessageHandler.js";
 import {Decryption as OlmDecryption} from "./e2ee/olm/Decryption.js";
+import {Encryption as OlmEncryption} from "./e2ee/olm/Encryption.js";
 import {Decryption as MegOlmDecryption} from "./e2ee/megolm/Decryption.js";
 import {DeviceTracker} from "./e2ee/DeviceTracker.js";
 import {LockMap} from "../utils/LockMap.js";
@@ -44,6 +45,7 @@ export class Session {
         this._olmUtil = null;
         this._e2eeAccount = null;
         this._deviceTracker = null;
+        this._olmEncryption = null;
         if (olm) {
             this._olmUtil = new olm.Utility();
             this._deviceTracker = new DeviceTracker({
@@ -68,6 +70,16 @@ export class Session {
             olm: this._olm,
             senderKeyLock
         });
+        this._olmEncryption = new OlmEncryption({
+            account: this._e2eeAccount,
+            pickleKey: PICKLE_KEY,
+            now: this._clock.now,
+            ownUserId: this._user.id,
+            storage: this._storage,
+            olm: this._olm,
+            olmUtil: this._olmUtil,
+            senderKeyLock
+        });
         const megolmDecryption = new MegOlmDecryption({pickleKey: PICKLE_KEY, olm: this._olm});
         this._deviceMessageHandler.enableEncryption({olmDecryption, megolmDecryption});
     }