diff --git a/pkgs/development/interpreters/joker/default.nix b/pkgs/development/interpreters/joker/default.nix
index c3b494783e74..ba65c00f1e9d 100644
--- a/pkgs/development/interpreters/joker/default.nix
+++ b/pkgs/development/interpreters/joker/default.nix
@@ -2,7 +2,7 @@
 
 buildGoPackage rec {
   name = "joker-${version}";
-  version = "0.12.2";
+  version = "0.12.4";
 
   goPackagePath = "github.com/candid82/joker";
 
@@ -10,11 +10,13 @@ buildGoPackage rec {
     rev = "v${version}";
     owner = "candid82";
     repo = "joker";
-    sha256 = "0cqz8k53fzz3xqx9czk3hgq164dsbvnk51s0j29g1bmkbl51c2vm";
+    sha256 = "1swi991khmyhxn6w6xsdqp1wbyx3qmd9d7yhpwvqasyxp8gg3szm";
   };
 
   preBuild = "go generate ./...";
 
+  postBuild = "rm go/bin/sum256dir";
+
   dontInstallSrc = true;
 
   excludedPackages = "gen"; # Do not install private generators.