diff --git a/src/embedding_client.py b/src/embedding_client.py
index e163cc66..d6c8b46d 100644
--- a/src/embedding_client.py
+++ b/src/embedding_client.py
@@ -99,7 +99,7 @@ class _EmbeddingClient:
             return self._validate_embedding_dimensions(response.embeddings[0].values)
         else:  # openai
             response = await self.client.embeddings.create(
-                model=self.model, input=query
+                model=self.model, input=[query]
             )
             return self._validate_embedding_dimensions(response.data[0].embedding)
 
diff --git a/tests/llm/test_embedding_client.py b/tests/llm/test_embedding_client.py
index 463b3dd6..14def176 100644
--- a/tests/llm/test_embedding_client.py
+++ b/tests/llm/test_embedding_client.py
@@ -51,7 +51,7 @@ async def test_openai_embedding_client_uses_configured_model_and_dimensions(
 
     assert embedding == [0.1] * 8
     assert fake_embeddings.calls == [
-        {"model": "text-embedding-3-small", "input": "hello world"}
+        {"model": "text-embedding-3-small", "input": ["hello world"]}
     ]