diff --git a/Week4/prep-exercises/1-hyf-program/2-class-list.js b/Week4/prep-exercises/1-hyf-program/2-class-list.js
index 995f9f1..44d2798 100644
--- a/Week4/prep-exercises/1-hyf-program/2-class-list.js
+++ b/Week4/prep-exercises/1-hyf-program/2-class-list.js
@@ -1,4 +1,4 @@
-import { modules, students, mentors, classes } from "./hyf";
+import { modules, students, mentors, classes } from "./hyf.js";
 
 /**
  * We would like to have a list of everyone that is currently participating in a class.