diff --git a/pkgs/development/python-modules/btrees/default.nix b/pkgs/development/python-modules/btrees/default.nix
index 5ed0b31e52b8..d900beca38a4 100644
--- a/pkgs/development/python-modules/btrees/default.nix
+++ b/pkgs/development/python-modules/btrees/default.nix
@@ -10,14 +10,15 @@
 }:
 
 buildPythonPackage rec {
-  pname = "BTrees";
+  pname = "btrees";
   version = "4.10.0";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "BTrees";
+    inherit version;
     hash = "sha256-1qsONBDQdNcVQkXW3GSTrobxtQvWCA0TEOuz7N6l3rY=";
   };