diff --git a/rollup.config.js b/rollup.config.js
index ca4ad87..9d47d4e 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -10,7 +10,7 @@ let cfg;
 const dest = process.env.DEST;
 if (!dest) {
   console.log("No destination specified - code will be compiled but not uploaded");
-} else if ((cfg = require("./screeps")[dest]) == null) {
+} else if ((cfg = require("./screeps.json")[dest]) == null) {
   throw new Error("Invalid upload destination");
 }