diff --git a/ui/button.js b/ui/button.js
index 31b3be2..04af0ed 100644
--- a/ui/button.js
+++ b/ui/button.js
@@ -1,4 +1,4 @@
-import UI from "./ui";
+import UI from "./ui.js";
 
 class Button extends UI {
     constructor(image) {
diff --git a/ui/panel.js b/ui/panel.js
index 2841fe3..2dca3b3 100644
--- a/ui/panel.js
+++ b/ui/panel.js
@@ -1,4 +1,4 @@
-import UI from "./ui";
+import UI from "./ui.js";
 
 class Panel extends UI {
     constructor(width, height) {