diff --git a/pymongo/results.py b/pymongo/results.py
index 8fb974b9ae..621fa48821 100644
--- a/pymongo/results.py
+++ b/pymongo/results.py
@@ -111,7 +111,7 @@ def matched_count(self):
         """The number of documents matched for this update."""
         self._raise_if_unacknowledged("matched_count")
         if self.upserted_id is not None:
-            return 0
+            return 1
         return self.__raw_result.get("n", 0)
 
     @property