diff --git a/library/init/lean/position.lean b/library/init/lean/position.lean
index f8a9336a92..847a9e1a83 100644
--- a/library/init/lean/position.lean
+++ b/library/init/lean/position.lean
@@ -26,6 +26,9 @@ protected def lt : Position → Position → Bool
 instance : HasFormat Position :=
 ⟨fun ⟨l, c⟩ => "⟨" ++ fmt l ++ ", " ++ fmt c ++ "⟩"⟩
 
+instance : HasToString Position :=
+⟨fun ⟨l, c⟩ => "⟨" ++ toString l ++ ", " ++ toString c ++ "⟩"⟩
+
 instance : Inhabited Position := ⟨⟨1, 0⟩⟩
 end Position