diff --git a/src/bidiag.jl b/src/bidiag.jl
index 2ccf6cf5..9bfd5332 100644
--- a/src/bidiag.jl
+++ b/src/bidiag.jl
@@ -189,10 +189,20 @@ end
 #Converting from Bidiagonal to dense Matrix
 function Matrix{T}(A::Bidiagonal) where T
     B = Matrix{T}(undef, size(A))
+    iszero(size(B,1)) && return B
     if haszero(T) # optimized path for types with zero(T) defined
         size(B,1) > 1 && fill!(B, zero(T))
-        copyto!(diagview(B), A.dv)
-        copyto!(diagview(B, _offdiagind(A.uplo)), A.ev)
+        isupper = A.uplo == 'U'
+        if isupper
+            B[1,1] = A.dv[1]
+        end
+        for col in axes(A.ev,1)
+            B[col+!isupper, col+isupper] = A.ev[col]
+            B[col+isupper, col+isupper] = A.dv[col+isupper]
+        end
+        if !isupper
+            B[end,end] = A.dv[end]
+        end
     else
         copyto!(B, A)
     end
diff --git a/src/tridiag.jl b/src/tridiag.jl
index 226b9417..4fcbfe9a 100644
--- a/src/tridiag.jl
+++ b/src/tridiag.jl
@@ -635,11 +635,15 @@ axes(M::Tridiagonal) = (ax = axes(M.d,1); (ax, ax))
 
 function Matrix{T}(M::Tridiagonal) where {T}
     A = Matrix{T}(undef, size(M))
+    iszero(size(A,1)) && return A
     if haszero(T) # optimized path for types with zero(T) defined
         size(A,1) > 2 && fill!(A, zero(T))
-        copyto!(diagview(A), M.d)
-        copyto!(diagview(A,1), M.du)
-        copyto!(diagview(A,-1), M.dl)
+        for i in axes(M.dl,1)
+            A[i,i] = M.d[i]
+            A[i+1,i] = M.dl[i]
+            A[i,i+1] = M.du[i]
+        end
+        A[end,end] = M.d[end]
     else
         copyto!(A, M)
     end