diff --git a/genotype_api/dto/sample.py b/genotype_api/dto/sample.py
index b0e8aca..804f51f 100644
--- a/genotype_api/dto/sample.py
+++ b/genotype_api/dto/sample.py
@@ -15,7 +15,7 @@ class AnalysisOnSample(BaseModel):
     sample_id: str | None = None
     plate_id: str | None = None
     id: int | None = None
-    genotypes: GenotypeResponse
+    genotypes: list[GenotypeResponse]
 
 
 class SampleResponse(BaseModel):