diff --git a/hosts/hetzner-arm/profiles/photoprism.nix b/hosts/hetzner-arm/profiles/photoprism.nix
index 2b098ce..9fc3786 100644
--- a/hosts/hetzner-arm/profiles/photoprism.nix
+++ b/hosts/hetzner-arm/profiles/photoprism.nix
@@ -104,7 +104,7 @@ in {
       };
     };
     extraConfig = ''
-      client_max_body_size ${toString 1024*32}M;
+      client_max_body_size ${toString (1024*32)}M;
     '';
   };