diff --git a/fdroidserver/metadata.py b/fdroidserver/metadata.py
index 1298f255..5f16beac 100644
--- a/fdroidserver/metadata.py
+++ b/fdroidserver/metadata.py
@@ -940,12 +940,9 @@ def write_yaml(mf, app):
         return builds
 
     yaml_app = _app_to_yaml(app)
-    try:
-        yaml = ruamel.yaml.YAML()
-        yaml.indent(mapping=4, sequence=4, offset=2)
-        yaml.dump(yaml_app, stream=mf)
-    except AttributeError:  # Debian/stretch's version does not have YAML()
-        ruamel.yaml.round_trip_dump(yaml_app, mf, indent=4, block_seq_indent=2)
+    yaml = ruamel.yaml.YAML()
+    yaml.indent(mapping=4, sequence=4, offset=2)
+    yaml.dump(yaml_app, stream=mf)
 
 
 def write_metadata(metadatapath, app):