diff --git a/pkgs/development/python-modules/pymsgbox/default.nix b/pkgs/development/python-modules/pymsgbox/default.nix
index a04923c18140..c05533638e65 100644
--- a/pkgs/development/python-modules/pymsgbox/default.nix
+++ b/pkgs/development/python-modules/pymsgbox/default.nix
@@ -1,11 +1,12 @@
 { lib, fetchPypi, buildPythonPackage, tkinter }:
 
 buildPythonPackage rec {
-  pname = "PyMsgBox";
+  pname = "pymsgbox";
   version = "1.0.9";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "PyMsgBox";
+    inherit version;
     hash = "sha256-IZQifei/96PW2lQYSHBaFV3LsqBu4SDZ8oCh1/USY/8=";
   };