diff --git a/release.nix b/release.nix
index 0b5b5579b..915732761 100644
--- a/release.nix
+++ b/release.nix
@@ -186,6 +186,8 @@ let
     deb_ubuntu1510x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1510x86_64) [ "libsodium-dev" ] [ "libsodium13" ];
     deb_ubuntu1604i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1604i386) [ "libsodium-dev" ] [ "libsodium18" ];
     deb_ubuntu1604x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1604x86_64) [ "libsodium-dev" ] [ "libsodium18" ];
+    deb_ubuntu1610i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1610i386) [ "libsodium-dev" ] [ "libsodium18" ];
+    deb_ubuntu1610x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1610x86_64) [ "libsodium-dev" ] [ "libsodium18" ];
 
 
     # System tests.
@@ -306,7 +308,7 @@ let
         { extraPackages =
             [ "libdbd-sqlite3-perl" "libsqlite3-dev" "libbz2-dev" "libwww-curl-perl" "libcurl-dev" "libcurl3-nss" "libssl-dev" "liblzma-dev" ]
             ++ extraPackages; };
-      memSize = 1024;
+      memSize = 8192;
       meta.schedulingPriority = 50;
       postInstall = "make installcheck";
       configureFlags = "--sysconfdir=/etc";
@@ -315,6 +317,7 @@ let
         ++ extraDebPackages;
       debMaintainer = "Eelco Dolstra <eelco.dolstra@logicblox.com>";
       doInstallCheck = true;
+      enableParallelBuilding = true;
     };