diff --git a/pkgs/servers/mautrix-telegram/default.nix b/pkgs/servers/mautrix-telegram/default.nix
index b2dd5f4a97c..ebf87d95b67 100644
--- a/pkgs/servers/mautrix-telegram/default.nix
+++ b/pkgs/servers/mautrix-telegram/default.nix
@@ -60,7 +60,7 @@ in with python.pkgs; buildPythonPackage rec {
     pillow
     lxml
     setuptools
-    prometheus-client
+    prometheus_client
   ] ++ lib.optionals withE2BE [
     asyncpg
     python-olm