diff --git a/src/Init/Data/ToString/Basic.lean b/src/Init/Data/ToString/Basic.lean
index 01b4335bd3..a70a3fbbdd 100644
--- a/src/Init/Data/ToString/Basic.lean
+++ b/src/Init/Data/ToString/Basic.lean
@@ -27,7 +27,6 @@ instance {α} [ToString α] : ToString (id α) :=
 instance {α} [ToString α] : ToString (Id α) :=
   inferInstanceAs (ToString α)
 
-@[defaultInstance low]
 instance : ToString String :=
   ⟨fun s => s⟩