diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 4fa2d33f76..b902aa7ff5 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -486,7 +486,7 @@ class Processor
 
 		$item['created'] = DateTimeFormat::utc($activity['published']);
 		$item['edited'] = DateTimeFormat::utc($activity['updated']);
-		$item['guid'] = $activity['diaspora:guid'] ?: self::getGUIDByURL($item['uri']);
+		$item['guid'] = $activity['diaspora:guid'] ?: $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 
 		$item = self::processContent($activity, $item);
 		if (empty($item)) {
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index 21aba50944..daca873365 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -983,6 +983,7 @@ class Receiver
 			$actor = JsonLD::fetchElement($object, 'as:actor', '@id');
 		}
 
+		$object_data['sc:identifier'] = JsonLD::fetchElement($object, 'sc:identifier', '@value');
 		$object_data['diaspora:guid'] = JsonLD::fetchElement($object, 'diaspora:guid', '@value');
 		$object_data['diaspora:comment'] = JsonLD::fetchElement($object, 'diaspora:comment', '@value');
 		$object_data['diaspora:like'] = JsonLD::fetchElement($object, 'diaspora:like', '@value');