diff --git a/plinth/tests/functional/__init__.py b/plinth/tests/functional/__init__.py
index acee59ca7..10e6511a9 100644
--- a/plinth/tests/functional/__init__.py
+++ b/plinth/tests/functional/__init__.py
@@ -638,7 +638,7 @@ class BaseAppTests:
     def test_run_diagnostics(self, session_browser):
         """Test that all app diagnostics are passing."""
         if not self.check_diagnostics:
-            pytest.skip(f'Skipping diagnostics check for ${self.app_name}.')
+            pytest.skip(f'Skipping diagnostics check for {self.app_name}.')
 
         time.sleep(self.diagnostics_delay)
         session_browser.find_by_id('id_extra_actions_button').click()