diff --git a/pkgs/servers/monitoring/prometheus/xmpp-alerts.nix b/pkgs/servers/monitoring/prometheus/xmpp-alerts.nix
index 437856c0350cb..f34d22a5faa82 100644
--- a/pkgs/servers/monitoring/prometheus/xmpp-alerts.nix
+++ b/pkgs/servers/monitoring/prometheus/xmpp-alerts.nix
@@ -2,7 +2,6 @@
 , fetchFromGitHub
 , python3Packages
 , prometheus-alertmanager
-, unittestCheckHook
 }:
 
 python3Packages.buildPythonApplication rec {