diff --git a/unit_tests/test_utils.py b/unit_tests/test_utils.py
index a59f8970..663a0488 100644
--- a/unit_tests/test_utils.py
+++ b/unit_tests/test_utils.py
@@ -23,7 +23,7 @@ def load_config():
 
     if not config:
         logging.error('Could not find config.yaml in any parent directory '
-                      'of %s. ' % file)
+                      'of %s. ' % f)
         raise Exception
 
     return yaml.safe_load(open(config).read())['options']