diff --git a/nixos/modules/issuer.nix b/nixos/modules/issuer.nix
index 3c293e7010815ccb3d3b9042491d2d0131e4c510..368b24ca4366de49aa6ac4a0069c3c1978710545 100644
--- a/nixos/modules/issuer.nix
+++ b/nixos/modules/issuer.nix
@@ -173,7 +173,7 @@ in {
       # Bail if there is still an old (root-owned) DB file on this system.
       # If you hit this, and this /var/db/ file is indeed current, move it to
       # /var/lib/zkapissuer/vouchers.sqlite3 and chown it to zkapissuer:zkapissuer.
-      unitConfig.ConditionPathExists = "!/var/db/vouchers.sqlite3";
+      unitConfig.AssertPathExists = "!/var/db/vouchers.sqlite3";
 
       script =
         let