diff --git a/hosts/pie/firefly.nix b/hosts/pie/firefly.nix
index acf3fe5..90ec305 100644
--- a/hosts/pie/firefly.nix
+++ b/hosts/pie/firefly.nix
@@ -42,7 +42,7 @@ in {
     };
     "firefly-importer.b12f.io" = {
       forceSSL = true;
-      useACMEHost = "firefly.b12f.io";
+      useACMEHost = "firefly-importer.b12f.io";
       locations."/".proxyPass = "http://127.0.0.1:8081";
     };
   };