diff --git a/app/javascript/flavours/glitch/components/exit_animation_wrapper.tsx b/app/javascript/flavours/glitch/components/exit_animation_wrapper.tsx
index dba7d3e92c..4339068565 100644
--- a/app/javascript/flavours/glitch/components/exit_animation_wrapper.tsx
+++ b/app/javascript/flavours/glitch/components/exit_animation_wrapper.tsx
@@ -26,7 +26,7 @@ export const ExitAnimationWrapper: React.FC<{
    * Render prop that provides the nested component with the `delayedIsActive` flag
    */
   children: (delayedIsActive: boolean) => React.ReactNode;
-}> = ({ isActive = false, delayMs = 500, withEntryDelay, children }) => {
+}> = ({ isActive, delayMs = 500, withEntryDelay, children }) => {
   const [delayedIsActive, setDelayedIsActive] = useState(
     isActive && !withEntryDelay,
   );
diff --git a/app/javascript/flavours/glitch/reducers/notification_groups.ts b/app/javascript/flavours/glitch/reducers/notification_groups.ts
index d890c32f37..230b5a2de3 100644
--- a/app/javascript/flavours/glitch/reducers/notification_groups.ts
+++ b/app/javascript/flavours/glitch/reducers/notification_groups.ts
@@ -292,7 +292,7 @@ function shouldMarkNewNotificationsAsRead(
 
 function updateLastReadId(
   state: NotificationGroupsState,
-  group: NotificationGroup | undefined = undefined,
+  group?: NotificationGroup,
 ) {
   if (shouldMarkNewNotificationsAsRead(state)) {
     group = group ?? state.groups.find(isNotificationGroup);