diff --git a/apps/dav/lib/CardDAV/CardDavBackend.php b/apps/dav/lib/CardDAV/CardDavBackend.php
index 20c025b037..606ed7add2 100644
--- a/apps/dav/lib/CardDAV/CardDavBackend.php
+++ b/apps/dav/lib/CardDAV/CardDavBackend.php
@@ -174,9 +174,6 @@ class CardDavBackend implements BackendInterface, SyncSupport {
 		$principals = $this->principalBackend->getGroupMembership($principalUriOriginal, true);
 		$principals = array_merge($principals, $this->principalBackend->getCircleMembership($principalUriOriginal));
 
-		$principals = array_map(function ($principal) {
-			return urldecode($principal);
-		}, $principals);
 		$principals[] = $principalUri;
 
 		$query = $this->db->getQueryBuilder();