diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index 2f29144a7b..bdd999d4cf 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -24,6 +24,13 @@ let
   urbit       = mkUrbit { debug = false; };
   urbit-debug = mkUrbit { debug = true; };
 
+  urbit-large-log = pkgs.stdenv.lib.overrideDerivation urbit (_: {
+    patches = [ ./urbit/patches/large-log-limit.patch ];
+    patchFlags = "-p3";
+  });
+
 in
 
-{ inherit ent ge-additions arvo arvo-ropsten herb urbit urbit-debug; }
+{ inherit ent ge-additions arvo arvo-ropsten herb;
+  inherit urbit urbit-debug urbit-large-log;
+}
diff --git a/nix/pkgs/urbit/builder.sh b/nix/pkgs/urbit/builder.sh
deleted file mode 100644
index 3bd7155383..0000000000
--- a/nix/pkgs/urbit/builder.sh
+++ /dev/null
@@ -1,15 +0,0 @@
-source $stdenv/setup
-
-cp -r $src ./src
-chmod -R u+w ./src
-cd src
-
-bash ./configure
-
-make clean
-make all -j8
-make test
-
-mkdir -p $out/bin
-cp ./build/urbit $out/bin/$exename
-cp ./build/urbit-worker $out/bin/$exename-worker
diff --git a/nix/pkgs/urbit/default.nix b/nix/pkgs/urbit/default.nix
index 2617f9afca..328b17f55e 100644
--- a/nix/pkgs/urbit/default.nix
+++ b/nix/pkgs/urbit/default.nix
@@ -27,9 +27,17 @@ let
     inherit name meta;
     exename = name;
     src     = ../../../pkg/urbit;
-    builder = ./builder.sh;
     nativeBuildInputs = deps ++ vendor;
 
+    installPhase = ''
+      make all -j8
+      make test
+
+      mkdir -p $out/bin
+      cp ./build/urbit $out/bin/$exename
+      cp ./build/urbit-worker $out/bin/$exename-worker
+    '';
+
     # See https://github.com/NixOS/nixpkgs/issues/18995
     hardeningDisable = if debug then [ "all" ] else [];
 
diff --git a/nix/pkgs/urbit/patches/large-log-limit.patch b/nix/pkgs/urbit/patches/large-log-limit.patch
new file mode 100644
index 0000000000..7d88d0d52d
--- /dev/null
+++ b/nix/pkgs/urbit/patches/large-log-limit.patch
@@ -0,0 +1,15 @@
+diff --git a/pkg/urbit/vere/lmdb.c b/pkg/urbit/vere/lmdb.c
+index b46cc66ee..b8f647dde 100644
+--- a/pkg/urbit/vere/lmdb.c
++++ b/pkg/urbit/vere/lmdb.c
+@@ -44,8 +44,8 @@ MDB_env* u3_lmdb_init(const char* log_path)
+   // TODO: Start with forty gigabytes for the maximum event log size. We'll
+   // need to do something more sophisticated for real in the long term, though.
+   //
+-  const size_t forty_gigabytes = 42949672960;
+-  ret_w = mdb_env_set_mapsize(env, forty_gigabytes);
++  const size_t sixty_gigabytes = 64424509440;
++  ret_w = mdb_env_set_mapsize(env, sixty_gigabytes);
+   if (ret_w != 0) {
+     u3l_log("lmdb: failed to set database size: %s\n", mdb_strerror(ret_w));
+     return 0;