diff --git a/js/ui/extensionDownloader.js b/js/ui/extensionDownloader.js
index 08ebc2fec..90fc5a616 100644
--- a/js/ui/extensionDownloader.js
+++ b/js/ui/extensionDownloader.js
@@ -238,7 +238,7 @@ class InstallExtensionDialog extends ModalDialog.ModalDialog {
 });
 
 function init() {
-    _httpSession = new Soup.SessionAsync({ ssl_use_system_ca_file: true });
+    _httpSession = new Soup.Session({ ssl_use_system_ca_file: true });
 
     // See: https://bugzilla.gnome.org/show_bug.cgi?id=655189 for context.
     // _httpSession.add_feature(new Soup.ProxyResolverDefault());