diff --git a/ament_index_python/test/test_ament_index_python.py b/ament_index_python/test/test_ament_index_python.py
index 7014394..f04689d 100644
--- a/ament_index_python/test/test_ament_index_python.py
+++ b/ament_index_python/test/test_ament_index_python.py
@@ -193,7 +193,7 @@ def get_package_share_directory_test(package_name, expect_prefix):
 
 def test_get_resource_types():
     set_ament_prefix_path([])
-    with pytest.raises(EnvironmentError) as excinfo:
+    with pytest.raises(EnvironmentError):
         get_resource_types()
 
     set_ament_prefix_path(['prefix1', 'prefix2'])