diff --git a/pkgs/applications/networking/mailreaders/claws-mail/default.nix b/pkgs/applications/networking/mailreaders/claws-mail/default.nix
index 01978a4da7e..cccfdbc7560 100644
--- a/pkgs/applications/networking/mailreaders/claws-mail/default.nix
+++ b/pkgs/applications/networking/mailreaders/claws-mail/default.nix
@@ -39,6 +39,8 @@ stdenv.mkDerivation rec {
     sha256 = "0hlm2jipyr4z6izlrpvabpz4ivh49i13avnm848kr1nv68pkq2cd";
   };
 
+  outputs = [ "out" "dev" ];
+
   patches = [ ./mime.patch ];
 
   hardeningDisable = [ "format" ];