diff --git a/stdlib/LinearAlgebra/src/qr.jl b/stdlib/LinearAlgebra/src/qr.jl
index 4e3baa7ca91c4..43d04ac5fa415 100644
--- a/stdlib/LinearAlgebra/src/qr.jl
+++ b/stdlib/LinearAlgebra/src/qr.jl
@@ -614,7 +614,6 @@ ldiv!(A::QRPivoted{T,<:StridedMatrix}, B::AbstractVector{T}) where {T<:BlasFloat
 ldiv!(A::QRPivoted{T,<:StridedMatrix}, B::AbstractMatrix{T}) where {T<:BlasFloat} =
     ldiv!(A, B, min(size(A)...)*eps(real(T)))[1]
 
-
 function _wide_qr_ldiv!(A::QR{T}, B::AbstractMatrix{T}) where T
     m, n = size(A)
     minmn = min(m,n)
@@ -646,14 +645,14 @@ function _wide_qr_ldiv!(A::QR{T}, B::AbstractMatrix{T}) where T
             B[m + 1:mB,1:nB] .= zero(T)
             for j = 1:nB
                 for k = 1:m
-                    vBj = B[k,j]
+                    vBj = B[k,j]'
                     for i = m + 1:n
-                        vBj += B[i,j]*R[k,i]'
+                        vBj += B[i,j]'*R[k,i]'
                     end
                     vBj *= τ[k]
-                    B[k,j] -= vBj
+                    B[k,j] -= vBj'
                     for i = m + 1:n
-                        B[i,j] -= R[k,i]*vBj
+                        B[i,j] -= R[k,i]'*vBj'
                     end
                 end
             end
diff --git a/stdlib/LinearAlgebra/test/qr.jl b/stdlib/LinearAlgebra/test/qr.jl
index cb15d94d08dcb..6e2e9a7b20603 100644
--- a/stdlib/LinearAlgebra/test/qr.jl
+++ b/stdlib/LinearAlgebra/test/qr.jl
@@ -474,4 +474,34 @@ end
     @test MyIdentity{Float64}()[1,:] == [1.0, 0.0]
 end
 
+@testset "issue #48911" begin
+    # testcase in the original issue
+    # test ldiv!(::QRPivoted, ::AbstractVector)
+    A = Complex{BigFloat}[1+im 1-im]
+    b = Complex{BigFloat}[3+im]
+    x = A\b
+    AF = Complex{Float64}[1+im 1-im]
+    bf = Complex{Float64}[3+im]
+    xf = AF\bf
+    @test x ≈ xf
+
+    # test ldiv!(::QRPivoted, ::AbstractVector)
+    A = Complex{BigFloat}[1+im 2-2im 3+3im; 4-4im 5+5im 6-6im]
+    b = Complex{BigFloat}[1+im; 0]
+    x = A\b
+    AF = Complex{Float64}[1+im 2-2im 3+3im; 4-4im 5+5im 6-6im]
+    bf = Complex{Float64}[1+im; 0]
+    xf = AF\bf
+    @test x ≈ xf
+
+    # test ldiv!(::QRPivoted, ::AbstractMatrix)
+    C = Complex{BigFloat}[1+im 2-2im 3+3im; 4-4im 5+5im 6-6im]
+    D = Complex{BigFloat}[1+im 1-im; 0 0]
+    x = C\D
+    CF = Complex{Float64}[1+im 2-2im 3+3im; 4-4im 5+5im 6-6im]
+    DF = Complex{Float64}[1+im 1-im; 0 0]
+    xf = CF\DF
+    @test x ≈ xf
+end
+
 end # module TestQR