diff --git a/opsdroid/connector/slack/create_events.py b/opsdroid/connector/slack/create_events.py
index 6872d1032..4b4280be4 100644
--- a/opsdroid/connector/slack/create_events.py
+++ b/opsdroid/connector/slack/create_events.py
@@ -101,7 +101,7 @@ async def edit_message(self, event, channel):
         return events.EditedMessage(
             text,
             user=user_name,
-            user_id=event["message"]["user"],
+            user_id=event["message"].get("user", event["message"]["username"]),
             target=event["channel"],
             connector=self.connector,
             event_id=event["ts"],