diff --git a/stdlib/LinearAlgebra/src/diagonal.jl b/stdlib/LinearAlgebra/src/diagonal.jl
index 2f02ec77b80b3..9a81bcdfaa1c2 100644
--- a/stdlib/LinearAlgebra/src/diagonal.jl
+++ b/stdlib/LinearAlgebra/src/diagonal.jl
@@ -407,7 +407,7 @@ end
 _has_matching_storage(out::UpperOrUnitUpperTriangular, A::UpperOrUnitUpperTriangular) = true
 _has_matching_storage(out::LowerOrUnitLowerTriangular, A::LowerOrUnitLowerTriangular) = true
 _has_matching_storage(out, A) = false
-function _rowrange_tri_stored(B::UpperOrUpperTriangular, col)
+function _rowrange_tri_stored(B::UpperOrUnitUpperTriangular, col)
     isunit = B isa UnitUpperTriangular
     1:min(col-isunit, size(B,1))
 end