diff --git a/src/components/views/rooms/SendMessageComposer.tsx b/src/components/views/rooms/SendMessageComposer.tsx
index 252957c2c77..ea49e9fcbe3 100644
--- a/src/components/views/rooms/SendMessageComposer.tsx
+++ b/src/components/views/rooms/SendMessageComposer.tsx
@@ -243,7 +243,7 @@ export class SendMessageComposer extends React.Component<ISendMessageComposerPro
     public static contextType = RoomContext;
     public declare context: React.ContextType<typeof RoomContext>;
 
-    private readonly prepareToEncrypt?: DebouncedFunc<() => void>;
+    private prepareToEncrypt?: DebouncedFunc<() => void>;
     private readonly editorRef = createRef<BasicMessageComposer>();
     private model: EditorModel;
     private currentlyComposedEditorState: SerializedPart[] | null = null;
@@ -253,25 +253,25 @@ export class SendMessageComposer extends React.Component<ISendMessageComposerPro
     public constructor(props: ISendMessageComposerProps, context: React.ContextType<typeof RoomContext>) {
         super(props, context);
 
-        if (this.props.mxClient.getCrypto() && this.props.mxClient.isRoomEncrypted(this.props.room.roomId)) {
-            this.prepareToEncrypt = throttle(
-                () => {
-                    this.props.mxClient.getCrypto()?.prepareToEncrypt(this.props.room);
-                },
-                60000,
-                { leading: true, trailing: false },
-            );
-        }
-
         const partCreator = new CommandPartCreator(this.props.room, this.props.mxClient);
         const parts = this.restoreStoredEditorState(partCreator) || [];
         this.model = new EditorModel(parts, partCreator);
         this.sendHistoryManager = new SendHistoryManager(this.props.room.roomId, "mx_cider_history_");
     }
 
-    public componentDidMount(): void {
+    public async componentDidMount(): Promise<void> {
         window.addEventListener("beforeunload", this.saveStoredEditorState);
         this.dispatcherRef = dis.register(this.onAction);
+
+        if (await this.props.mxClient.getCrypto()?.isEncryptionEnabledInRoom(this.props.room.roomId)) {
+            this.prepareToEncrypt = throttle(
+                () => {
+                    this.props.mxClient.getCrypto()?.prepareToEncrypt(this.props.room);
+                },
+                60000,
+                { leading: true, trailing: false },
+            );
+        }
     }
 
     public componentDidUpdate(prevProps: ISendMessageComposerProps): void {
diff --git a/test/unit-tests/components/views/rooms/SendMessageComposer-test.tsx b/test/unit-tests/components/views/rooms/SendMessageComposer-test.tsx
index e423d03ea9f..aa45525c4f0 100644
--- a/test/unit-tests/components/views/rooms/SendMessageComposer-test.tsx
+++ b/test/unit-tests/components/views/rooms/SendMessageComposer-test.tsx
@@ -605,7 +605,7 @@ describe("<SendMessageComposer/>", () => {
 
     it("should call prepareToEncrypt when the user is typing", async () => {
         const cli = stubClient();
-        cli.isRoomEncrypted = jest.fn().mockReturnValue(true);
+        jest.spyOn(cli.getCrypto()!, "isEncryptionEnabledInRoom").mockResolvedValue(true);
         const room = mkStubRoom("!roomId:server", "Room", cli);
 
         expect(cli.getCrypto()!.prepareToEncrypt).not.toHaveBeenCalled();