diff --git a/bluesky/bluesky.php b/bluesky/bluesky.php
index dfd7fe06..26ecb967 100644
--- a/bluesky/bluesky.php
+++ b/bluesky/bluesky.php
@@ -715,7 +715,7 @@ function bluesky_create_activity(array $item, stdClass $parent = null)
 	}
 	Logger::debug('Activity done', ['return' => $activity]);
 	$uri = bluesky_get_uri($activity);
-	Item::update(['extid' => $uri], ['id' => $item['id']]);
+	Item::update(['extid' => $uri], ['guid' => $item['guid']]);
 	Logger::debug('Set extid', ['id' => $item['id'], 'extid' => $activity]);
 }
 
@@ -806,7 +806,7 @@ function bluesky_create_post(array $item, stdClass $root = null, stdClass $paren
 		}
 		if (($key == 0) && ($item['gravity'] != Item::GRAVITY_PARENT)) {
 			$uri = bluesky_get_uri($parent);
-			Item::update(['extid' => $uri], ['id' => $item['id']]);
+			Item::update(['extid' => $uri], ['guid' => $item['guid']]);
 			Logger::debug('Set extid', ['id' => $item['id'], 'extid' => $uri]);
 		}
 	}
diff --git a/tumblr/tumblr.php b/tumblr/tumblr.php
index 1e9f5c7f..ecd6f862 100644
--- a/tumblr/tumblr.php
+++ b/tumblr/tumblr.php
@@ -564,7 +564,7 @@ function tumblr_send(array &$b)
 			if ($result->meta->status < 400) {
 				Logger::info('Successfully performed activity', ['verb' => $b['verb'], 'deleted' => $b['deleted'], 'meta' => $result->meta, 'response' => $result->response]);
 				if (!$b['deleted'] && !empty($result->response->id_string)) {
-					Item::update(['extid' => 'tumblr::' . $result->response->id_string], ['id' => $b['id']]);
+					Item::update(['extid' => 'tumblr::' . $result->response->id_string], ['guid' => $b['guid']]);
 				}
 			} else {
 				Logger::notice('Error while performing activity', ['verb' => $b['verb'], 'deleted' => $b['deleted'], 'meta' => $result->meta, 'response' => $result->response, 'errors' => $result->errors, 'params' => $params]);