diff --git a/tests/test_highlighting.py b/tests/test_highlighting.py
index 525af2547..c2b470a6b 100644
--- a/tests/test_highlighting.py
+++ b/tests/test_highlighting.py
@@ -40,7 +40,7 @@ class ComplainOnUnhighlighted(PygmentsBridge):
 
 
 def test_add_lexer(app, status, warning):
-    app.add_lexer('test', MyLexer())
+    app.add_lexer('test', MyLexer)
 
     bridge = PygmentsBridge('html')
     ret = bridge.highlight_block('ab', 'test')