diff --git a/python/lancedb/embeddings/base.py b/python/lancedb/embeddings/base.py
index 04d1360d..41474227 100644
--- a/python/lancedb/embeddings/base.py
+++ b/python/lancedb/embeddings/base.py
@@ -33,6 +33,7 @@ class EmbeddingFunction(BaseModel, ABC):
     3. ndims method which returns the number of dimensions of the vector column
     """
 
+    __slots__ = ("__weakref__",)  # pydantic 1.x compatibility
     max_retries: int = (
         7  # Setitng 0 disables retires. Maybe this should not be enabled by default,
     )