diff --git a/pkgs/development/interpreters/pyrex/0.9.5.nix b/pkgs/development/interpreters/pyrex/0.9.5.nix
index be11b38a0b8..009f9b48ea4 100644
--- a/pkgs/development/interpreters/pyrex/0.9.5.nix
+++ b/pkgs/development/interpreters/pyrex/0.9.5.nix
@@ -1,4 +1,4 @@
-{ fetchurl, python2Packages }:
+{ stdenv, fetchurl, python2Packages }:
 
 let version = "0.9.5.1.1"; in
 
@@ -15,5 +15,6 @@ python2Packages.buildPythonPackage rec {
   meta = {
     homepage = http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/;
     description = "A language for writing Python extension modules";
+    license = stdenv.lib.licenses.asl20;
   };
 }
diff --git a/pkgs/development/interpreters/pyrex/0.9.6.nix b/pkgs/development/interpreters/pyrex/0.9.6.nix
index 2a18dbff9e6..c2ccae71eff 100644
--- a/pkgs/development/interpreters/pyrex/0.9.6.nix
+++ b/pkgs/development/interpreters/pyrex/0.9.6.nix
@@ -15,5 +15,6 @@ python2Packages.buildPythonPackage rec {
   meta = {
     homepage = http://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/;
     description = "A language for writing Python extension modules";
+    license = stdenv.lib.licenses.asl20;
   };
 }