diff --git a/src/actions/MatrixActionCreators.js b/src/actions/MatrixActionCreators.js
index 1998ecfef2..6e1d52a88f 100644
--- a/src/actions/MatrixActionCreators.js
+++ b/src/actions/MatrixActionCreators.js
@@ -163,6 +163,26 @@ function createRoomMembershipAction(matrixClient, membershipEvent, member, oldMe
     return { action: 'MatrixActions.RoomMember.membership', member };
 }
 
+/**
+ * @typedef EventDecryptedAction
+ * @type {Object}
+ * @property {string} action 'MatrixActions.Event.decrypted'.
+ * @property {MatrixEvent} event the matrix event that was decrypted.
+ */
+
+/**
+ * Create a MatrixActions.Event.decrypted action that represents
+ * a MatrixClient `Event.decrypted` matrix event, emitted when a
+ * matrix event is decrypted.
+ *
+ * @param {MatrixClient} matrixClient the matrix client.
+ * @param {MatrixEvent} event the matrix event that was decrypted.
+ * @returns {EventDecryptedAction} an action of type `MatrixActions.Event.decrypted`.
+ */
+function createEventDecryptedAction(matrixClient, event) {
+    return { action: 'MatrixActions.Event.decrypted', event };
+}
+
 /**
  * This object is responsible for dispatching actions when certain events are emitted by
  * the given MatrixClient.
@@ -183,6 +203,7 @@ export default {
         this._addMatrixClientListener(matrixClient, 'Room.tags', createRoomTagsAction);
         this._addMatrixClientListener(matrixClient, 'Room.timeline', createRoomTimelineAction);
         this._addMatrixClientListener(matrixClient, 'RoomMember.membership', createRoomMembershipAction);
+        this._addMatrixClientListener(matrixClient, 'Event.decrypted', createEventDecryptedAction);
     },
 
     /**
diff --git a/src/stores/RoomListStore.js b/src/stores/RoomListStore.js
index 80db6ca9a8..7660cf8df8 100644
--- a/src/stores/RoomListStore.js
+++ b/src/stores/RoomListStore.js
@@ -87,6 +87,20 @@ class RoomListStore extends Store {
                 this._generateRoomLists();
             }
             break;
+            // When an event is decrypted, it could mean we need to reorder the room
+            // list because we now know the type of the event.
+            case 'MatrixActions.Event.decrypted': {
+                const room = this._matrixClient.getRoom(payload.event.getRoomId());
+                const liveTimeline = room.getLiveTimeline();
+                const eventTimeline = room.getTimelineForEvent(payload.event.getId());
+
+                if (!this._state.ready ||
+                    liveTimeline !== eventTimeline ||
+                    !this._eventTriggersRecentReorder(payload.event)
+                ) break;
+                this._generateRoomLists();
+            }
+            break;
             case 'MatrixActions.accountData': {
                 if (payload.event_type !== 'm.direct') break;
                 this._generateRoomLists();