diff --git a/apps/dav/lib/CardDAV/SystemAddressbook.php b/apps/dav/lib/CardDAV/SystemAddressbook.php
index 502e353acb313..2dae4aa544bc4 100644
--- a/apps/dav/lib/CardDAV/SystemAddressbook.php
+++ b/apps/dav/lib/CardDAV/SystemAddressbook.php
@@ -50,4 +50,13 @@ public function getChildren() {
 
 		return parent::getChildren();
 	}
+
+	public function getACL() {
+		return array_filter(parent::getACL(), function($acl) {
+			if (in_array($acl['privilege'], ['{DAV:}write', '{DAV:}all'], true)) {
+				return false;
+			}
+			return true;
+		});
+	}
 }