diff --git a/lib/livebook/application.ex b/lib/livebook/application.ex
index f9f3f2a2f..6db36017a 100644
--- a/lib/livebook/application.ex
+++ b/lib/livebook/application.ex
@@ -242,6 +242,8 @@ defmodule Livebook.Application do
   end
 
   defp iframe_port_in_use(port) do
-    Livebook.Config.abort!("Failed to start Livebook iframe server because port #{port} is already in use")
+    Livebook.Config.abort!(
+      "Failed to start Livebook iframe server because port #{port} is already in use"
+    )
   end
 end