diff --git a/src/lib/array.jl b/src/lib/array.jl
index d1057b560..ae1fece1d 100644
--- a/src/lib/array.jl
+++ b/src/lib/array.jl
@@ -462,8 +462,6 @@ end
 # LinAlg Matrix Types
 # ===================
 
-@adjoint LinearAlgebra.LowerTriangular(A) = LowerTriangular(A), Δ->(LowerTriangular(Δ),)
-@adjoint LinearAlgebra.UpperTriangular(A) = UpperTriangular(A), Δ->(UpperTriangular(Δ),)
 @adjoint LinearAlgebra.UnitLowerTriangular(A) = UnitLowerTriangular(A), Δ->(UnitLowerTriangular(Δ)-I,)
 @adjoint LinearAlgebra.UnitUpperTriangular(A) = UnitUpperTriangular(A), Δ->(UnitUpperTriangular(Δ)-I,)