diff --git a/src/components/views/messages/MFileBody.tsx b/src/components/views/messages/MFileBody.tsx
index f5dfec155e3..d7542b97407 100644
--- a/src/components/views/messages/MFileBody.tsx
+++ b/src/components/views/messages/MFileBody.tsx
@@ -110,8 +110,6 @@ export default class MFileBody extends React.Component<IProps, IState> {
 
     public state: IState = {};
 
-    public state: IState = {};
-
     public static defaultProps = {
         showGenericPlaceholder: true,
     };
diff --git a/src/models/Call.ts b/src/models/Call.ts
index fc23ef9d573..658cb780487 100644
--- a/src/models/Call.ts
+++ b/src/models/Call.ts
@@ -126,8 +126,8 @@ interface CallEventHandlerMap {
  * A group call accessed through a widget.
  */
 export abstract class Call extends TypedEventEmitter<CallEvent, CallEventHandlerMap> {
-    protected readonly widgetUid;
-    protected readonly room;
+    protected readonly widgetUid: string;
+    protected readonly room: Room;
 
     /**
      * The time after which device member state should be considered expired.
diff --git a/test/test-utils/call.ts b/test/test-utils/call.ts
index 5aeb466244f..21672b98867 100644
--- a/test/test-utils/call.ts
+++ b/test/test-utils/call.ts
@@ -68,7 +68,7 @@ export class MockedCall extends Call {
         CallStore.instance.updateRoom(room);
     }
 
-    public readonly groupCall;
+    public readonly groupCall: GroupCall;
 
     public get participants(): Map<RoomMember, Set<string>> {
         return super.participants;