diff --git a/flake.nix b/flake.nix
index ce44c43..92284e5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,7 +9,7 @@
       inherit (builtins) fromTOML readFile substring;
 
       cargoToml = fromTOML (readFile ./Cargo.toml);
-      version = "${cargoToml.package.version}_${substring 0 8 self.lastModifiedDate}_${self.shortRev or "dirty"}";
+      version = "${cargoToml.package.version}+${substring 0 8 self.lastModifiedDate}.${self.shortRev or "dirty"}";
 
       mkVnetod = { lib, rustPlatform, ... }:
         rustPlatform.buildRustPackage {