diff --git a/pkgs/servers/mautrix-telegram/default.nix b/pkgs/servers/mautrix-telegram/default.nix
index fd26dfd3fc5f..87c13e972f5d 100644
--- a/pkgs/servers/mautrix-telegram/default.nix
+++ b/pkgs/servers/mautrix-telegram/default.nix
@@ -54,6 +54,7 @@ in python.pkgs.buildPythonPackage rec {
     pillow
     lxml
     setuptools
+    prometheus-client
   ] ++ lib.optionals withE2BE [
     asyncpg
     python-olm