diff --git a/tests/desktop_update_graphical.pm b/tests/desktop_update_graphical.pm
index ebcf6948..b803b77c 100644
--- a/tests/desktop_update_graphical.pm
+++ b/tests/desktop_update_graphical.pm
@@ -13,7 +13,7 @@ sub run {
     prepare_test_packages;
     # sometimes, the test is failing because it cannot
     # refresh packages for Gnome Software. Let's do it explicitely.
-    assert_script_run "su -c \"pkcon refresh force\" -s /bin/sh test"
+    assert_script_run "su -c \"pkcon refresh force\" -s /bin/sh test";
     # get back to the desktop
     desktop_vt;
     # run the updater