diff --git a/libs/langchain/langchain/embeddings/mosaicml.py b/libs/langchain/langchain/embeddings/mosaicml.py
index d7eb9b1526b..934ffb83901 100644
--- a/libs/langchain/langchain/embeddings/mosaicml.py
+++ b/libs/langchain/langchain/embeddings/mosaicml.py
@@ -64,7 +64,7 @@ class MosaicMLInstructorEmbeddings(BaseModel, Embeddings):
     def _embed(
         self, input: List[Tuple[str, str]], is_retry: bool = False
     ) -> List[List[float]]:
-        payload = {"input_strings": input}
+        payload = {"inputs": input}
 
         # HTTP headers for authorization
         headers = {