diff --git a/pkgs/tools/security/gencfsm/default.nix b/pkgs/tools/security/gencfsm/default.nix
index c180ca6c720..aade96ed389 100644
--- a/pkgs/tools/security/gencfsm/default.nix
+++ b/pkgs/tools/security/gencfsm/default.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation rec {
 
   preFixup = ''gappsWrapperArgs+=(--prefix PATH : ${encfs}/bin)'';
 
+  enableParallelBuilding = true;
+
   meta = with stdenv.lib; {
     homepage = http://www.libertyzero.com/GEncfsM/;
     downloadPage = https://launchpad.net/gencfsm/;
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4d834fb249a..2e903c058e8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1100,7 +1100,9 @@ with pkgs;
 
   geekbench = callPackage ../tools/misc/geekbench { };
 
-  gencfsm = callPackage ../tools/security/gencfsm { };
+  gencfsm = callPackage ../tools/security/gencfsm {
+    vala = vala_0_34;
+  };
 
   genromfs = callPackage ../tools/filesystems/genromfs { };