diff --git a/pkgs/tools/security/crunch/default.nix b/pkgs/tools/security/crunch/default.nix
index 2422a2278bb5..0c7620124d15 100644
--- a/pkgs/tools/security/crunch/default.nix
+++ b/pkgs/tools/security/crunch/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, fetchurl, which }:
 
-stdenv.mkDerivation  rec {
+stdenv.mkDerivation rec {
   pname = "crunch";
   version = "3.6";
 
@@ -24,6 +24,7 @@ stdenv.mkDerivation  rec {
     description = "Wordlist generator";
     homepage = "https://sourceforge.net/projects/crunch-wordlist/";
     platforms = platforms.unix;
+    license = with licenses; [ gpl2Only ];
     maintainers = with maintainers; [ lethalman lnl7 ];
   };
 }