diff --git a/src/Core/Protocol.php b/src/Core/Protocol.php
index 759a6e70e6..0ecc076a0f 100644
--- a/src/Core/Protocol.php
+++ b/src/Core/Protocol.php
@@ -25,6 +25,8 @@ class Protocol
 
 	const FEDERATED = [self::DFRN, self::DIASPORA, self::OSTATUS, self::ACTIVITYPUB];
 
+	const SUPPORT_PRIVATE = [self::DFRN, self::DIASPORA, self::MAIL, self::ACTIVITYPUB, self::PUMPIO];
+
 	// Supported through a connector
 	const DIASPORA2 = 'dspc';    // Diaspora connector
 	const LINKEDIN  = 'lnkd';    // LinkedIn
diff --git a/src/Model/Group.php b/src/Model/Group.php
index a9d2f462e6..965dfe8d7f 100644
--- a/src/Model/Group.php
+++ b/src/Model/Group.php
@@ -336,7 +336,7 @@ class Group extends BaseObject
 			$followersStmt = Contact::select(['id'], [
 				'uid' => $uid,
 				'rel' => [Contact::FOLLOWER, Contact::FRIEND],
-				'protocol' => Protocol::NATIVE_SUPPORT,
+				'protocol' => Protocol::SUPPORT_PRIVATE,
 			]);
 
 			while($follower = DBA::fetch($followersStmt)) {
@@ -351,7 +351,7 @@ class Group extends BaseObject
 			$mutualsStmt = Contact::select(['id'], [
 				'uid' => $uid,
 				'rel' => [Contact::FRIEND],
-				'protocol' => Protocol::NATIVE_SUPPORT,
+				'protocol' => Protocol::SUPPORT_PRIVATE,
 			]);
 
 			while($mutual = DBA::fetch($mutualsStmt)) {