diff --git a/pkgs/tools/security/tpm-luks/default.nix b/pkgs/tools/security/tpm-luks/default.nix
index 25e28f158315..2af4a742208c 100644
--- a/pkgs/tools/security/tpm-luks/default.nix
+++ b/pkgs/tools/security/tpm-luks/default.nix
@@ -29,6 +29,7 @@ stdenv.mkDerivation {
     description = "LUKS key storage in TPM NVRAM";
     homepage    = "https://github.com/shpedoikal/tpm-luks/";
     maintainers = [ maintainers.tstrobel ];
+    license = with licenses; [ gpl2Only ];
     platforms   = platforms.linux;
   };
 }