diff --git a/pkgs/applications/misc/klayout/default.nix b/pkgs/applications/misc/klayout/default.nix
index dd7f062492f9..645e5f619a2b 100644
--- a/pkgs/applications/misc/klayout/default.nix
+++ b/pkgs/applications/misc/klayout/default.nix
@@ -16,13 +16,13 @@
 
 mkDerivation rec {
   pname = "klayout";
-  version = "0.30.4";
+  version = "0.30.4-1";
 
   src = fetchFromGitHub {
     owner = "KLayout";
     repo = "klayout";
     rev = "v${version}";
-    hash = "sha256-iG1f43gvKcu8jlVJ47IH5A6Ld8zusEbZL2Xou6ix5QU=";
+    hash = "sha256-EhIGxiXqo09/p8mA00RRvKgXJncVr4qguYSPyEC0fqc=";
   };
 
   postPatch = ''