diff --git a/transformPROJJSON.js b/transformPROJJSON.js
index 3d03b47..74eccd6 100644
--- a/transformPROJJSON.js
+++ b/transformPROJJSON.js
@@ -1,4 +1,4 @@
-import { applyProjectionDefaults } from "./util";
+import { applyProjectionDefaults } from "./util.js";
 
 // Helper function to process units and to_meter
 function processUnit(unit) {