diff --git a/main.js b/main.js
index 293d84ff..5ae5af74 100644
--- a/main.js
+++ b/main.js
@@ -731,6 +731,7 @@ async function generate(options) {
     Production.collectResources();
 
     Trade.defineCenters();
+    Trade.calculateDistances();
     Trade.exportGoods();
     Trade.importGoods();