4 files changed, 4 insertions, 4 deletions
diff --git a/pkgs/tools/compression/gzip/default.nix b/pkgs/tools/compression/gzip/default.nix
index b1d127635f6..b7bf9c59f49 100644
--- a/pkgs/tools/compression/gzip/default.nix
+++ b/pkgs/tools/compression/gzip/default.nix
@@ -29,6 +29,6 @@ stdenv.mkDerivation rec {
         is just a bonus.
       '';
 
-    license = "GPLv3+";
+    license = stdenv.lib.licenses.gpl3Plus;
   };
 }
diff --git a/pkgs/tools/compression/lrzip/default.nix b/pkgs/tools/compression/lrzip/default.nix
index 6fd1ae97d96..51f61fcf239 100644
--- a/pkgs/tools/compression/lrzip/default.nix
+++ b/pkgs/tools/compression/lrzip/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://ck.kolivas.org/apps/lrzip/;
     description = "The CK LRZIP compression program (LZMA + RZIP)";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
     inherit version;
   };
 }
diff --git a/pkgs/tools/compression/rzip/default.nix b/pkgs/tools/compression/rzip/default.nix
index 8c4547753aa..ca8d356abb3 100644
--- a/pkgs/tools/compression/rzip/default.nix
+++ b/pkgs/tools/compression/rzip/default.nix
@@ -11,6 +11,6 @@ stdenv.mkDerivation {
   meta = {
     homepage = http://rzip.samba.org/;
     description = "The RZIP compression program";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
   };
 }
diff --git a/pkgs/tools/compression/upx/default.nix b/pkgs/tools/compression/upx/default.nix
index 283b751cf26..c012be7c56d 100644
--- a/pkgs/tools/compression/upx/default.nix
+++ b/pkgs/tools/compression/upx/default.nix
@@ -29,6 +29,6 @@ stdenv.mkDerivation {
   meta = {
     homepage = http://upx.sourceforge.net/;
     description = "The Ultimate Packer for eXecutables";
-    license = "GPLv2+";
+    license = stdenv.lib.licenses.gpl2Plus;
   };
 }