diff --git a/horizon.dhall b/horizon.dhall
index b1e5065561a85359a58844ed9b869ee5872e7325..3aeb6c00b547e5d31c499ac2025f809093a409ba 100644
--- a/horizon.dhall
+++ b/horizon.dhall
@@ -723,6 +723,7 @@ in  H.HorizonExport.MakePackageSet
           , H.callHackage "servant-swagger-ui-core" "0.3.5"
           , H.callHackage "servant-static-th" "1.0.0.0"
           , H.callHackage "setenv" "0.1.1.3"
+          , H.callHackage "setlocale" "1.0.0.10"
           , H.callHackage "shakespeare" "2.0.30"
           , H.callHackage "shake" "0.19.6"
           , H.callHackage "shelly" "1.10.0"
diff --git a/initial-packages.nix b/initial-packages.nix
index 7f39a81d489c44c53fa7b716513ca8d627d2e2e2..533bd73406202736ed66fcb524f0fe3ecfc23f72 100644
--- a/initial-packages.nix
+++ b/initial-packages.nix
@@ -1147,6 +1147,8 @@ self: with pkgs.haskell.lib; {
 
   setenv = self.callPackage (./pkgs/setenv.nix) { };
 
+  setlocale = self.callPackage (./pkgs/setlocale.nix) { };
+
   shake = self.callPackage (./pkgs/shake.nix) { };
 
   shakespeare = self.callPackage (./pkgs/shakespeare.nix) { };
diff --git a/pkgs/setlocale.nix b/pkgs/setlocale.nix
new file mode 100644
index 0000000000000000000000000000000000000000..2b5851a50881fbaa5ccf24415cac42a2906128a3
--- /dev/null
+++ b/pkgs/setlocale.nix
@@ -0,0 +1,23 @@
+{ mkDerivation, base, lib }:
+mkDerivation {
+  pname = "setlocale";
+  version = "1.0.0.10";
+  sha256 = "3972ff10c22318f5451215dc886c1535fea5ab7dfefe5ce461b1603865423ba7";
+  revision = "2";
+  editedCabalFile = "1k4idj2xl9dg5nfz128xazrrydz9mgm3bbjrc0cyby8n3c0ij9x1";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [ base ];
+  enableLibraryProfiling = true;
+  enableExecutableProfiling = true;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  homepage = "https://gitlab.com/Kritzefitz/haskell-setlocale/";
+  description = "Haskell bindings to setlocale";
+  license = lib.licenses.bsd3;
+  broken = false;
+}