diff --git a/nylas/client/neural_api_models.py b/nylas/client/neural_api_models.py
index a0710631..e4aa8ce2 100644
--- a/nylas/client/neural_api_models.py
+++ b/nylas/client/neural_api_models.py
@@ -165,7 +165,7 @@ def __init__(self, api):
         RestfulModel.__init__(self, NeuralCleanConversation, api)
 
     def extract_images(self):
-        pattern = "[\(']cid:(.*?)[\)']"
+        pattern = r"[\(']cid:(.*?)[\)']"
         file_ids = re.findall(pattern, self.conversation)
         files = []
         for match in file_ids: