diff --git a/machines/neo/dendrite/default.nix b/machines/neo/dendrite/default.nix
index ff3ae3b..4d2be7d 100644
--- a/machines/neo/dendrite/default.nix
+++ b/machines/neo/dendrite/default.nix
@@ -71,6 +71,9 @@ let
         }
       ];
     };
+    sync_api = {
+      real_ip_header = "X-Forwarded-For";
+    };
     media_api = {
       base_path = "${workingDir}/media_store";