diff --git a/examples/build-config-file.py b/examples/build-config-file.py
index b1fb9e4cf2b96f1452fff7e43cdf01acdf29eece..3948f1d50506d729ac1a93e95cc08b0f4f0f9fb3 100644
--- a/examples/build-config-file.py
+++ b/examples/build-config-file.py
@@ -169,4 +169,4 @@ if __name__ == "__main__":
     options["resources"]["alphabet-sorted"] = alphabet_sorted
 
     with open(output, 'w') as f:
-        f.write(yaml.dump(options, encoding="utf-8", default_flow_style=False))
+        f.write(yaml.dump(options, encoding=None, default_flow_style=False))