diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c550ba7e0a0d..cdeb09ae3185 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -65,8 +65,7 @@ let
   # providing Python modules.
   makePythonPath = drvs: lib.makeSearchPath python.sitePackages (requiredPythonModules drvs);
 
-  removePythonPrefix = name:
-    removePrefix namePrefix name;
+  removePythonPrefix = lib.removePrefix namePrefix;
 
   # Convert derivation to a Python module.
   toPythonModule = drv: