diff --git a/document_stores/elasticsearch/src/elasticsearch_haystack/document_store.py b/document_stores/elasticsearch/src/elasticsearch_haystack/document_store.py
index bcb9d1075..2e16110e6 100644
--- a/document_stores/elasticsearch/src/elasticsearch_haystack/document_store.py
+++ b/document_stores/elasticsearch/src/elasticsearch_haystack/document_store.py
@@ -220,7 +220,6 @@ def _deserialize_document(self, hit: Dict[str, Any]) -> Document:
             content=data["content"],
             dataframe=data["dataframe"],
             blob=data["blob"],
-            mime_type=data["mime_type"],
             meta=data.get("meta", {}),
             score=data["score"],
             embedding=data["embedding"],