diff --git a/Nevanlinna/meromorphicOn.lean b/Nevanlinna/meromorphicOn.lean
index ec8c4a2..86b3749 100644
--- a/Nevanlinna/meromorphicOn.lean
+++ b/Nevanlinna/meromorphicOn.lean
@@ -28,6 +28,8 @@ theorem MeromorphicOn.open_of_order_eq_top
   constructor
   · intro w hw
     simp
+    rw [MeromorphicAt.order_eq_top_iff]
+
     sorry
   · constructor
     · exact isOpen_induced h₂t'