diff --git a/spec/vncserver_spec.py b/spec/vncserver_spec.py
index fa63936..82faa1b 100644
--- a/spec/vncserver_spec.py
+++ b/spec/vncserver_spec.py
@@ -51,8 +51,7 @@ with description('vncserver') as self:
     with it('asks user to select a DE on the first run'):
         add_kasmvnc_user_docker()
 
-        cmd = f'{vncserver_cmd}'
-        completed_process = run_cmd(cmd, input="1\ny\n")
+        completed_process = run_cmd(vncserver_cmd, input="1\ny\n")
         expect(completed_process.returncode).to(equal(0))
 
         check_de_was_setup_to_run('cinnamon')