diff --git a/pkgs/development/python-modules/Pmw/default.nix b/pkgs/development/python-modules/pmw/default.nix
similarity index 90%
rename from pkgs/development/python-modules/Pmw/default.nix
rename to pkgs/development/python-modules/pmw/default.nix
index f88346d66489..ec120848a8c2 100644
--- a/pkgs/development/python-modules/Pmw/default.nix
+++ b/pkgs/development/python-modules/pmw/default.nix
@@ -1,11 +1,12 @@
 { lib , buildPythonPackage , fetchPypi, tkinter }:
 
 buildPythonPackage rec {
-  pname = "Pmw";
+  pname = "pmw";
   version = "2.1.1";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "Pmw";
+    inherit version;
     sha256 = "sha256-lIQSRXz8zwx3XdCOCRP7APkIlqM8eXN9VxxzEq6vVcY=";
   };
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index da0088642c14..418b8d12a851 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7445,7 +7445,7 @@ self: super: with self; {
 
   plyvel = callPackage ../development/python-modules/plyvel { };
 
-  Pmw = callPackage ../development/python-modules/Pmw { };
+  pmw = callPackage ../development/python-modules/pmw { };
 
   pocket = callPackage ../development/python-modules/pocket { };