diff --git a/pkgs/servers/mautrix-telegram/default.nix b/pkgs/servers/mautrix-telegram/default.nix
index bb2549f939f..b2dd5f4a97c 100644
--- a/pkgs/servers/mautrix-telegram/default.nix
+++ b/pkgs/servers/mautrix-telegram/default.nix
@@ -60,6 +60,7 @@ in with python.pkgs; buildPythonPackage rec {
     pillow
     lxml
     setuptools
+    prometheus-client
   ] ++ lib.optionals withE2BE [
     asyncpg
     python-olm