diff --git a/Mathlib/Algebra/Lie/Quotient.lean b/Mathlib/Algebra/Lie/Quotient.lean
index e6ae53a34c3e9..367d16adeac24 100644
--- a/Mathlib/Algebra/Lie/Quotient.lean
+++ b/Mathlib/Algebra/Lie/Quotient.lean
@@ -43,7 +43,7 @@ instance : HasQuotient M (LieSubmodule R L M) :=
 
 namespace Quotient
 
-variable {N I}
+variable {N}
 
 instance addCommGroup : AddCommGroup (M ⧸ N) :=
   Submodule.Quotient.addCommGroup _