diff --git a/llama_stack/providers/remote/vector_io/pgvector/pgvector.py b/llama_stack/providers/remote/vector_io/pgvector/pgvector.py
index ea918c552..7d58a49f3 100644
--- a/llama_stack/providers/remote/vector_io/pgvector/pgvector.py
+++ b/llama_stack/providers/remote/vector_io/pgvector/pgvector.py
@@ -116,7 +116,7 @@ class PGVectorIndex(EmbeddingIndex):
             scores = []
             for doc, dist in results:
                 chunks.append(Chunk(**doc))
-                scores.append(1.0 / float(dist))
+                scores.append(1.0 / float(dist) if dist != 0 else float("inf"))
 
             return QueryChunksResponse(chunks=chunks, scores=scores)