diff --git a/pixelfed.nix b/pixelfed.nix
index 03b6d616..5649018c 100644
--- a/pixelfed.nix
+++ b/pixelfed.nix
@@ -47,4 +47,10 @@ in
     AWS_ENDPOINT = "http://s3.garage.localhost:3900";
     AWS_USE_PATH_STYLE_ENDPOINT = false;
   };
+
+  ## Only ever run `pixelfed-data-setup` after `ensure-garage` has done its job.
+  ## Otherwise, everything crashed dramatically.
+  systemd.services.pixelfed-data-setup = {
+    after = [ "ensure-garage.service" ];
+  };
 }