diff --git a/pkgs/by-name/ac/acme/package.nix b/pkgs/by-name/ac/acme/package.nix
index 8131a6dcdd99..bc3ea21358e7 100644
--- a/pkgs/by-name/ac/acme/package.nix
+++ b/pkgs/by-name/ac/acme/package.nix
@@ -6,7 +6,7 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "acme";
-  version = "unstable-2021-11-05";
+  version = "0.97-unstable-2021-11-05";
 
   src = fetchsvn {
     url = "svn://svn.code.sf.net/p/acme-crossass/code-0/trunk";