diff --git a/nixos/modules/issuer.nix b/nixos/modules/issuer.nix
index 2222d834c3aab43638ec9c7333bac7dfe9b4c90a..a65eed5a3539f2d5ba67870782635a1ae7209582 100644
--- a/nixos/modules/issuer.nix
+++ b/nixos/modules/issuer.nix
@@ -161,7 +161,7 @@ in {
               # Only for automated testing.
               "--http-port 80";
 
-          prefixOption = s: "--allow-origin=" + s;
+          prefixOption = s: "--cors-origin=" + s;
           originStrings = map prefixOption cfg.allowedChargeOrigins;
           originArgs = builtins.concatStringsSep " " originStrings;