diff --git a/storepaths_format b/storepaths_format
index dbb20caa111..5b71b007445 100644
--- a/storepaths_format
+++ b/storepaths_format
@@ -1,4 +1,5 @@
 /nix/store/abcd-<package>
+deriver
 2
 /nix/store/1234-<package-1>
 /nix/store/5678-<package-2>