diff --git a/pkgs/by-name/du/duplicity/package.nix b/pkgs/by-name/du/duplicity/package.nix
index f821a73aa2bf..6417b0b8f1db 100644
--- a/pkgs/by-name/du/duplicity/package.nix
+++ b/pkgs/by-name/du/duplicity/package.nix
@@ -156,7 +156,7 @@ let
       updateScript = nix-update-script {
         extraArgs = [
           "--version-regex"
-          "rel\.(.*)"
+          "rel\\.(.*)"
         ];
       };