diff --git a/python/hyperon/runner.py b/python/hyperon/runner.py
index 0120b6b33..353708f74 100644
--- a/python/hyperon/runner.py
+++ b/python/hyperon/runner.py
@@ -251,4 +251,4 @@ def custom_env(working_dir = None, config_dir = None, create_config = False, dis
             hp.env_builder_set_is_test(True)
         for path in reversed(include_paths):
             hp.env_builder_add_include_path(builder, path)
-        return builder
+        return builder
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