diff --git a/pkgs/development/python-modules/flask-session/default.nix b/pkgs/development/python-modules/flask-session/default.nix
index a777bf0920ab..e3c4abf8da8a 100644
--- a/pkgs/development/python-modules/flask-session/default.nix
+++ b/pkgs/development/python-modules/flask-session/default.nix
@@ -8,7 +8,7 @@
 }:
 
 buildPythonPackage rec {
-  pname = "Flask-Session";
+  pname = "flask-session";
   version = "0.5.0";
   format = "pyproject";