diff --git a/pkgs/applications/networking/sipcmd/default.nix b/pkgs/applications/networking/sipcmd/default.nix
index 4c8a90137bd..a36c2286956 100644
--- a/pkgs/applications/networking/sipcmd/default.nix
+++ b/pkgs/applications/networking/sipcmd/default.nix
@@ -28,6 +28,7 @@ stdenv.mkDerivation rec {
     homepage = https://github.com/tmakkonen/sipcmd;
     description = "The command line SIP/H.323/RTP softphone";
     platforms = with stdenv.lib.platforms; linux;
+    license = stdenv.lib.licenses.gpl2;
   };
 }