diff --git a/pkgs/development/libraries/libqalculate/default.nix b/pkgs/development/libraries/libqalculate/default.nix
index 377d9fe50be..2c25d418119 100644
--- a/pkgs/development/libraries/libqalculate/default.nix
+++ b/pkgs/development/libraries/libqalculate/default.nix
@@ -42,6 +42,7 @@ stdenv.mkDerivation rec {
     description = "An advanced calculator library";
     homepage = http://qalculate.github.io;
     maintainers = with maintainers; [ gebner ];
+    license = licenses.gpl2Plus;
     platforms = platforms.all;
   };
 }