diff --git a/pkgs/tools/typesetting/tex/auctex/default.nix b/pkgs/tools/typesetting/tex/auctex/default.nix
index 1ab009458405..b86822609768 100644
--- a/pkgs/tools/typesetting/tex/auctex/default.nix
+++ b/pkgs/tools/typesetting/tex/auctex/default.nix
@@ -32,6 +32,7 @@ let auctex = stdenv.mkDerivation ( rec {
     description = "Extensible package for writing and formatting TeX files in GNU Emacs and XEmacs";
     homepage = http://www.gnu.org/software/auctex;
     platforms = stdenv.lib.platforms.unix;
+    license = stdenv.lib.licenses.gpl3;
   };
 });