diff --git a/pkgs/by-name/pk/pkcs11-provider/package.nix b/pkgs/by-name/pk/pkcs11-provider/package.nix
index f27bd11a934d..70f3f586cc3f 100644
--- a/pkgs/by-name/pk/pkcs11-provider/package.nix
+++ b/pkgs/by-name/pk/pkcs11-provider/package.nix
@@ -80,7 +80,7 @@ stdenv.mkDerivation rec {
   passthru.updateScript = nix-update-script {
     extraArgs = [
       "--version-regex"
-      "v(\d\.\d)"
+      "v(\\d\\.\\d)"
     ];
   };