diff --git a/stdlib/LinearAlgebra/src/triangular.jl b/stdlib/LinearAlgebra/src/triangular.jl
index 07a28f7f575a02..20353d25ff9d39 100644
--- a/stdlib/LinearAlgebra/src/triangular.jl
+++ b/stdlib/LinearAlgebra/src/triangular.jl
@@ -1551,7 +1551,7 @@ end
 #   Higham and Lin, "An improved Schur-Padé algorithm for fractional powers of
 #     a matrix and their Fréchet derivatives", SIAM. J. Matrix Anal. & Appl.,
 #     34(3), (2013) 1341–1360.
-function powm!(A0::UpperTriangular{<:BlasFloat}, p::Real)
+function powm!(A0::UpperTriangular, p::Real)
     if abs(p) >= 1
         throw(ArgumentError("p must be a real number in (-1,1), got $p"))
     end
@@ -1583,7 +1583,7 @@ function powm!(A0::UpperTriangular{<:BlasFloat}, p::Real)
         end
         copyto!(Stmp, S)
         mul!(S, A, c)
-        ldiv!(Stmp, S.data)
+        ldiv!(Stmp, S)
 
         c = (p - j) / (j4 - 2)
         for i = 1:n
@@ -1591,14 +1591,14 @@ function powm!(A0::UpperTriangular{<:BlasFloat}, p::Real)
         end
         copyto!(Stmp, S)
         mul!(S, A, c)
-        ldiv!(Stmp, S.data)
+        ldiv!(Stmp, S)
     end
     for i = 1:n
         S[i, i] = S[i, i] + 1
     end
     copyto!(Stmp, S)
     mul!(S, A, -p)
-    ldiv!(Stmp, S.data)
+    ldiv!(Stmp, S)
     for i = 1:n
         @inbounds S[i, i] = S[i, i] + 1
     end
diff --git a/stdlib/LinearAlgebra/test/dense.jl b/stdlib/LinearAlgebra/test/dense.jl
index efeedf93ebd1fc..ad887dd85a0d34 100644
--- a/stdlib/LinearAlgebra/test/dense.jl
+++ b/stdlib/LinearAlgebra/test/dense.jl
@@ -1067,6 +1067,11 @@ end
     end
 end
 
+@testset "BigFloat triangular real power" begin
+    A = Float64[3 1; 0 3]
+    @test A^(3/4) ≈ big.(A)^(3/4)
+end
+
 @testset "diagonal integer matrix to real power" begin
     A = Matrix(Diagonal([1, 2, 3]))
     @test A^2.3 ≈ float(A)^2.3