diff --git a/tests/analysis/predicate/genotype/conftest.py b/tests/analysis/predicate/genotype/conftest.py
index 037e3712..7fc94356 100644
--- a/tests/analysis/predicate/genotype/conftest.py
+++ b/tests/analysis/predicate/genotype/conftest.py
@@ -24,6 +24,7 @@ def protein_metadata_service() -> ProteinMetadataService:
                 FeatureType.DOMAIN,
             ),
         ),
+        protein_length=100,
     )
     return MockProteinMetadataService(response)