diff --git a/disco/types/message.py b/disco/types/message.py
index a2bddd6..ae03e5d 100644
--- a/disco/types/message.py
+++ b/disco/types/message.py
@@ -128,7 +128,7 @@ class MessageActivity(SlottedModel):
         The party id from a Rich Presence event.
     """
     type = Field(enum(MessageActivityType))
-    party_id = int(text)
+    party_id = Field(text)
 
 
 class MessageEmbedFooter(SlottedModel):