diff --git a/semantic_router/encoders/mistral.py b/semantic_router/encoders/mistral.py
index 3fc230512945bb4b3f6d7495425b2c004f732daf..bd6f5045822cdacbabb8ddbfed787b6ef3791f3c 100644
--- a/semantic_router/encoders/mistral.py
+++ b/semantic_router/encoders/mistral.py
@@ -67,7 +67,7 @@ class MistralEncoder(BaseEncoder):
 
         if (
             not embeds
-            or not isinstance(embeds, self._embedding_response)
+            or not isinstance(embeds, self._mistralai.models.embeddings.EmbeddingResponse)
             or not embeds.data
         ):
             raise ValueError(f"No embeddings returned from MistralAI: {error_message}")