diff --git a/lib/hooks/theme.js b/lib/hooks/theme.js
index 373db7d81..cd8382be6 100644
--- a/lib/hooks/theme.js
+++ b/lib/hooks/theme.js
@@ -1,69 +1,67 @@
 // @flow
 
 import * as React from 'react';
 
 import { updateThemeInfoActionType } from '../actions/theme-actions.js';
 import type { Shape } from '../types/core.js';
 import type {
   GlobalTheme,
   GlobalThemeInfo,
   GlobalThemePreference,
 } from '../types/theme-types.js';
 import { useSelector, useDispatch } from '../utils/redux-utils.js';
 
 function useUpdateSystemTheme(): (colorScheme: ?GlobalTheme) => mixed {
   const globalThemeInfo = useSelector(state => state.globalThemeInfo);
   const dispatch = useDispatch();
 
   return React.useCallback(
     (colorScheme: ?GlobalTheme) => {
       if (globalThemeInfo.systemTheme === colorScheme) {
         return;
       }
 
       let updateObject: Shape<GlobalThemeInfo> = {
         systemTheme: colorScheme,
       };
       if (globalThemeInfo.preference === 'system') {
         updateObject = { ...updateObject, activeTheme: colorScheme };
       }
 
       dispatch({
         type: updateThemeInfoActionType,
         payload: updateObject,
       });
     },
     [globalThemeInfo, dispatch],
   );
 }
 
 function useUpdateThemePreference(): (
   themePreference: GlobalThemePreference,
 ) => mixed {
   const globalThemeInfo = useSelector(state => state.globalThemeInfo);
   const dispatch = useDispatch();
 
   return React.useCallback(
     (themePreference: GlobalThemePreference) => {
       if (themePreference === globalThemeInfo.preference) {
         return;
       }
-
-      let theme = themePreference;
-      if (themePreference === 'system') {
-        theme = globalThemeInfo.systemTheme;
-      }
-
+      const theme =
+        themePreference === 'system'
+          ? globalThemeInfo.systemTheme
+          : themePreference;
       dispatch({
         type: updateThemeInfoActionType,
         payload: {
           preference: themePreference,
           activeTheme: theme,
         },
       });
     },
     [globalThemeInfo, dispatch],
   );
 }
 
 export { useUpdateSystemTheme, useUpdateThemePreference };