diff --git a/pkgs/development/compilers/vala/default.nix b/pkgs/development/compilers/vala/default.nix
index baf48d7a532c..1679407f39c2 100644
--- a/pkgs/development/compilers/vala/default.nix
+++ b/pkgs/development/compilers/vala/default.nix
@@ -12,6 +12,8 @@ let
       inherit sha256;
     };
 
+    outputs = [ "out" "devdoc" ];
+
     nativeBuildInputs = [ pkgconfig flex bison libxslt ] ++ extraNativeBuildInputs;
 
     buildInputs = [ glib libiconv ] ++ libintlOrEmpty ++ extraBuildInputs;