diff --git a/src/github.com/matrix-org/dendrite/clientapi/thirdpartyinvites/thirdpartyinvites.go b/src/github.com/matrix-org/dendrite/clientapi/thirdpartyinvites/thirdpartyinvites.go
index def913700..c998a6522 100644
--- a/src/github.com/matrix-org/dendrite/clientapi/thirdpartyinvites/thirdpartyinvites.go
+++ b/src/github.com/matrix-org/dendrite/clientapi/thirdpartyinvites/thirdpartyinvites.go
@@ -335,11 +335,9 @@ func emit3PIDInviteEvent(
 		DisplayName:    res.DisplayName,
 		KeyValidityURL: validityURL,
 		PublicKey:      res.PublicKey,
+		PublicKeys:     res.PublicKeys,
 	}
 
-	content.PublicKeys = make([]common.PublicKey, len(res.PublicKeys))
-	copy(content.PublicKeys, res.PublicKeys)
-
 	if err := builder.SetContent(content); err != nil {
 		return err
 	}