diff --git a/src/Module/Api/Mastodon/InstanceV2.php b/src/Module/Api/Mastodon/InstanceV2.php
index 64d0955629..5e7511c028 100644
--- a/src/Module/Api/Mastodon/InstanceV2.php
+++ b/src/Module/Api/Mastodon/InstanceV2.php
@@ -85,6 +85,7 @@ class InstanceV2 extends BaseApi
 		$domain               = $this->baseUrl->getHost();
 		$title                = $this->config->get('config', 'sitename');
 		$version              = '2.8.0 (compatible; Friendica ' . App::VERSION . ')';
+		$source_url           = 'https://git.friendi.ca/friendica/friendica';
 		$description          = $this->config->get('config', 'info');
 		$usage                = $this->buildUsageInfo();
 		$thumbnail            = new InstanceEntity\Thumbnail($this->baseUrl . $this->contactHeader->getMastodonBannerPath());
@@ -98,6 +99,7 @@ class InstanceV2 extends BaseApi
 			$domain,
 			$title,
 			$version,
+			$source_url,
 			$description,
 			$usage,
 			$thumbnail,
diff --git a/src/Object/Api/Mastodon/InstanceV2.php b/src/Object/Api/Mastodon/InstanceV2.php
index ec32b944f0..89cca6daa7 100644
--- a/src/Object/Api/Mastodon/InstanceV2.php
+++ b/src/Object/Api/Mastodon/InstanceV2.php
@@ -81,6 +81,7 @@ class InstanceV2 extends BaseDataTransferObject
 		string              $domain,
 		string              $title,
 		string              $version,
+		string              $source_url,
 		string              $description,
 		Usage               $usage,
 		Thumbnail           $thumbnail,
@@ -94,7 +95,7 @@ class InstanceV2 extends BaseDataTransferObject
 		$this->domain        = $domain;
 		$this->title         = $title;
 		$this->version       = $version;
-		$this->source_url    = null; //not supported yet
+		$this->source_url    = $source_url;
 		$this->description   = $description;
 		$this->usage         = $usage;
 		$this->thumbnail     = $thumbnail;