diff --git a/main.js b/main.js
index c011bfb3..eca7c611 100644
--- a/main.js
+++ b/main.js
@@ -727,6 +727,7 @@ async function generate(options) {
     Production.collectResources();
 
     Trade.defineCenters();
+    Trade.calculateDistances();
     Trade.exportGoods();
     Trade.importGoods();