diff --git a/formats/kexec-bundle.nix b/formats/kexec-bundle.nix
index e18bce0..e2878d7 100644
--- a/formats/kexec-bundle.nix
+++ b/formats/kexec-bundle.nix
@@ -3,4 +3,5 @@
   imports = [ ./kexec.nix ];
 
   formatAttr = lib.mkForce "kexec_bundle";
+  filename = lib.mkForce "*-kexec_bundle";
 }