diff --git a/gnu/packages/emacs-xyz.scm b/gnu/packages/emacs-xyz.scm
index 98c9c9f712..f434895b4b 100644
--- a/gnu/packages/emacs-xyz.scm
+++ b/gnu/packages/emacs-xyz.scm
@@ -11233,7 +11233,7 @@ (define-public emacs-helm-firefox
          (uri (git-reference
                (url "https://github.com/emacs-helm/helm-firefox.git")
                (commit commit)))
-         (file-name (string-append name "-" version "-checkout"))
+         (file-name (git-file-name name version))
          (sha256
           (base32
            "08mjsi2f9s29fkk35cj1rrparjnkm836qmbfdwdz7y51f9varjbs"))))