diff --git a/pkgs/applications/science/biology/cmtk/default.nix b/pkgs/applications/science/biology/cmtk/default.nix
index b479d65b788d..a131c6645499 100644
--- a/pkgs/applications/science/biology/cmtk/default.nix
+++ b/pkgs/applications/science/biology/cmtk/default.nix
@@ -8,13 +8,13 @@
 , zlib
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "cmtk";
   version = "3.3.2";
 
   src = fetchurl {
     name = "cmtk-source.tar.gz";
-    url = "https://www.nitrc.org/frs/download.php/13188/CMTK-${version}-Source.tar.gz//?i_agree=1&download_now=1";
+    url = "https://www.nitrc.org/frs/download.php/13188/CMTK-${finalAttrs.version}-Source.tar.gz//?i_agree=1&download_now=1";
     hash = "sha256-iE164NCOSOypZLLZfZy9RTyrS+YnY9ECqfb4QhlsMS4=";
   };
 
@@ -35,13 +35,13 @@ stdenv.mkDerivation rec {
   ];
 
   meta = with lib; {
-    description = "Computational Morphometry Toolkit ";
+    description = "Computational Morphometry Toolkit";
     longDescription = ''A software toolkit for computational morphometry of
       biomedical images, CMTK comprises a set of command line tools and a
       back-end general-purpose library for processing and I/O'';
     maintainers = with maintainers; [ tbenst ];
     platforms = platforms.all;
-    license = licenses.gpl3;
+    license = licenses.gpl3Plus;
     homepage = "https://www.nitrc.org/projects/cmtk/";
   };
-}
+})