diff --git a/src/course-outline/data/slice.js b/src/course-outline/data/slice.js
index ec9b6975a5..d376d62412 100644
--- a/src/course-outline/data/slice.js
+++ b/src/course-outline/data/slice.js
@@ -72,10 +72,8 @@ const slice = createSlice({
       state.sectionsList = state.sectionsList.map((section) => (section.id === payload.id ? payload : section));
     },
     reorderSectionList: (state, { payload }) => {
-      let sectionsList = [...state.sectionsList];
-      sectionsList.sort(function(a, b){
-        return payload.indexOf(a.id) - payload.indexOf(b.id);
-      });
+      const sectionsList = [...state.sectionsList];
+      sectionsList.sort((a, b) => payload.indexOf(a.id) - payload.indexOf(b.id));
 
       state.sectionsList = [...sectionsList];
     },