diff --git a/src/krylov_utils.jl b/src/krylov_utils.jl
index a1805b66c..c296350da 100644
--- a/src/krylov_utils.jl
+++ b/src/krylov_utils.jl
@@ -180,13 +180,18 @@ end
 
 Return a dense storage type `S` based on the type of `v`.
 """
-function ktypeof(v :: AbstractVector)
+function ktypeof(v :: AbstractVector{T}) where T
   S = typeof(v)
   if S <: SubArray
-    S = S.types[1]  # SubArray
+    S = S.types[1]
   end
-  if S <: AbstractSparseVector
-    S = S <: SparseVector ? S.types[3] : S.types[2]  # SparseVector / CuSparseVector
+  str = string(S)
+  vec = SubString(str, 1, findfirst("{", str).start-1)
+  if vec ∈ ("BlockVector", "Zeros", "SparseVector")
+    S = Vector{T}
+  end
+  if vec == "CuSparseVector"
+    S = CuVector{T}
   end
   return S
 end