diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -70,6 +70,7 @@
 } from '../types/user-types';
 import { useDispatchActionPromise, useServerCall } from '../utils/action-utils';
 import type { DispatchActionPromise } from '../utils/action-utils';
+import { values } from '../utils/objects';
 import { useSelector } from '../utils/redux-utils';
 import { firstLine } from '../utils/string-utils';
 import { pluralize, trimText } from '../utils/text-utils';
@@ -82,23 +83,24 @@
   return tinycolor(`#${color}`).isDark();
 }
 
-const selectedThreadColorsObj = {
-  '4B87AA': 1,
-  '5C9F5F': 2,
-  'B8753D': 3,
-  'AA4B4B': 4,
-  '6D49AB': 5,
-  'C85000': 6,
-  '008F83': 7,
-  '648CAA': 8,
-  '57697F': 9,
-  '575757': 10,
-};
-
-const selectedThreadColors: $ReadOnlyArray<string> = Object.keys(
+const selectedThreadColorsObj = Object.freeze({
+  a: '4B87AA',
+  b: '5C9F5F',
+  c: 'B8753D',
+  d: 'AA4B4B',
+  e: '6D49AB',
+  f: 'C85000',
+  g: '008F83',
+  h: '648CAA',
+  i: '57697F',
+  j: '575757',
+});
+
+const selectedThreadColors: $ReadOnlyArray<string> = values(
   selectedThreadColorsObj,
 );
-export type SelectedThreadColors = $Keys<typeof selectedThreadColorsObj>;
+
+export type SelectedThreadColors = $Values<typeof selectedThreadColorsObj>;
 
 function generateRandomColor(): string {
   return selectedThreadColors[