diff --git a/manifest.dhall b/manifest.dhall
index 5e4eb11db1b2c079308c2eea6cc88dd04fefe70e..7fe4feb614482be7418a8cfa295ac55183046bfc 100644
--- a/manifest.dhall
+++ b/manifest.dhall
@@ -728,6 +728,7 @@ in  [ callHackage "Cabal" "3.8.1.0"
         "https://github.com/parsonsmatt/typerep-map"
         (Some "75b7cd5d45986be07420a6821d352ad2adc0b697")
         (None Text)
+    , callHackage "uglymemo" "0.1.0.1"
     , callHackage "unagi-chan" "0.4.1.4"
     , callHackage "unicode-collation" "0.1.3.2"
     , callHackage "unicode-data" "0.4.0"
diff --git a/overlay.nix b/overlay.nix
index 34f7f10c9c6d8e092b2caf33e3fd682b6fc66945..0d4a5b60bb4436ab67ab41ecd26fd4d8b1d9d83b 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -1091,6 +1091,8 @@ self: with pkgs.haskell.lib; {
 
   typerep-map = self.callPackage (./pkgs/typerep-map.nix) { };
 
+  uglymemo = self.callPackage (./pkgs/uglymemo.nix) { };
+
   unagi-chan = self.callPackage (./pkgs/unagi-chan.nix) { };
 
   unicode-collation = self.callPackage (./pkgs/unicode-collation.nix) { };
diff --git a/pkgs/uglymemo.nix b/pkgs/uglymemo.nix
new file mode 100644
index 0000000000000000000000000000000000000000..e417f54ce6e004e1a5aaa7acfa565da05f104a6c
--- /dev/null
+++ b/pkgs/uglymemo.nix
@@ -0,0 +1,20 @@
+{ mkDerivation, base, containers, lib }:
+mkDerivation {
+  pname = "uglymemo";
+  version = "0.1.0.1";
+  sha256 = "fe89ef49c0cb15867c58815b050b33f17d394d4c48a9b7240a39780a5a79b847";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [ base containers ];
+  enableLibraryProfiling = false;
+  enableExecutableProfiling = false;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  description = "A simple (but internally ugly) memoization function";
+  license = lib.licenses.publicDomain;
+  broken = false;
+}