diff --git a/packages/dynamic-import/client.js b/packages/dynamic-import/client.js
index 298f61e69f..d34aef856f 100644
--- a/packages/dynamic-import/client.js
+++ b/packages/dynamic-import/client.js
@@ -121,7 +121,11 @@ var fetchURL = require("./common.js").fetchURL;
 
 function fetchMissing(missingTree) {
   return new Promise(function (resolve, reject) {
-    HTTP.call("POST", Meteor.absoluteUrl(fetchURL), {
+    // Always match the protocol (http or https) and the domain:port of
+    // the current page.
+    var url = "//" + location.host + fetchURL;
+
+    HTTP.call("POST", url, {
       query: secretKey ? "key=" + secretKey : void 0,
       data: missingTree
     }, function (error, result) {