diff --git a/lib/actions/activity-actions.js b/lib/actions/activity-actions.js
--- a/lib/actions/activity-actions.js
+++ b/lib/actions/activity-actions.js
@@ -22,6 +22,7 @@
 } from '../types/activity-types.js';
 import type { DMChangeThreadReadStatusOperation } from '../types/dm-ops.js';
 import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types';
+import { threadTypeIsThick } from '../types/thread-types-enum.js';
 import { useSelector } from '../utils/redux-utils.js';
 
 export type UpdateActivityInput = {
@@ -109,19 +110,12 @@
     };
   };
 
-export type UseSetThreadUnreadStatusInput = $ReadOnly<
-  | {
-      +thick: false,
-      ...SetThreadUnreadStatusRequest,
-    }
-  | {
-      +thick: true,
-      +threadInfo: ThreadInfo,
-      ...SetThreadUnreadStatusRequest,
-    },
->;
+export type UseSetThreadUnreadStatusInput = {
+  +threadInfo: ThreadInfo,
+  ...SetThreadUnreadStatusRequest,
+};
 function useSetThreadUnreadStatus(): (
-  imput: UseSetThreadUnreadStatusInput,
+  input: UseSetThreadUnreadStatusInput,
 ) => Promise<SetThreadUnreadStatusPayload> {
   const viewerID = useSelector(
     state => state.currentUserInfo && state.currentUserInfo.id,
@@ -131,8 +125,8 @@
 
   return React.useCallback(
     async (input: UseSetThreadUnreadStatusInput) => {
-      if (!input.thick) {
-        const { thick, ...rest } = input;
+      if (!threadTypeIsThick(input.threadInfo.type)) {
+        const { threadInfo, ...rest } = input;
         return await keyserverCall({ ...rest });
       }
 
diff --git a/lib/hooks/toggle-unread-status.js b/lib/hooks/toggle-unread-status.js
--- a/lib/hooks/toggle-unread-status.js
+++ b/lib/hooks/toggle-unread-status.js
@@ -9,7 +9,6 @@
 import type { UseSetThreadUnreadStatusInput } from '../actions/activity-actions.js';
 import type { SetThreadUnreadStatusPayload } from '../types/activity-types.js';
 import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
-import { threadTypeIsThick } from '../types/thread-types-enum.js';
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
 
 function useToggleUnreadStatus(
@@ -24,18 +23,12 @@
   ) => Promise<SetThreadUnreadStatusPayload> = useSetThreadUnreadStatus();
 
   const toggleUnreadStatus = React.useCallback(() => {
-    const request = {
+    const input = {
+      threadInfo,
       threadID: threadInfo.id,
       unread: !currentUser.unread,
       latestMessage: mostRecentNonLocalMessage,
     };
-    const input = threadTypeIsThick(threadInfo.type)
-      ? {
-          thick: true,
-          threadInfo,
-          ...request,
-        }
-      : { thick: false, ...request };
 
     void dispatchActionPromise(
       setThreadUnreadStatusActionTypes,