diff --git a/src/HYPRE.jl b/src/HYPRE.jl
index b8ab947..07b11a2 100644
--- a/src/HYPRE.jl
+++ b/src/HYPRE.jl
@@ -208,7 +208,7 @@ function Internals.to_hypre_data(A::SparseMatrixCSR, ilower, iupper)
 end
 
 # TODO: Default to ilower = 1, iupper = size(B, 1)?
-function HYPREMatrix(B::Union{SparseMatrixCSC,SparseMatrixCSR}, ilower, iupper, comm::MPI.Comm=MPI.COMM_WORLD)
+function HYPREMatrix(comm::MPI.Comm, B::Union{SparseMatrixCSC,SparseMatrixCSR}, ilower, iupper)
     A = HYPREMatrix(comm, ilower, iupper)
     nrows, ncols, rows, cols, values = Internals.to_hypre_data(B, ilower, iupper)
     @check HYPRE_IJMatrixSetValues(A.IJMatrix, nrows, ncols, rows, cols, values)
@@ -216,6 +216,9 @@ function HYPREMatrix(B::Union{SparseMatrixCSC,SparseMatrixCSR}, ilower, iupper,
     return A
 end
 
+HYPREMatrix(B::Union{SparseMatrixCSC,SparseMatrixCSR}, ilower, iupper) =
+    HYPREMatrix(MPI.COMM_WORLD, B, ilower, iupper)
+
 #########################
 # Vector -> HYPREVector #
 #########################
@@ -229,7 +232,7 @@ end
 # TODO: Internals.to_hypre_data(x::SparseVector, ilower, iupper) (?)
 
 # TODO: Default to ilower = 1, iupper = length(x)?
-function HYPREVector(x::Vector, ilower, iupper, comm=MPI.COMM_WORLD)
+function HYPREVector(comm::MPI.Comm, x::Vector, ilower, iupper)
     b = HYPREVector(comm, ilower, iupper)
     nvalues, indices, values = Internals.to_hypre_data(x, ilower, iupper)
     @check HYPRE_IJVectorSetValues(b.IJVector, nvalues, indices, values)
@@ -237,6 +240,8 @@ function HYPREVector(x::Vector, ilower, iupper, comm=MPI.COMM_WORLD)
     return b
 end
 
+HYPREVector(x::Vector, ilower, iupper) = HYPREVector(MPI.COMM_WORLD, x, ilower, iupper)
+
 function Base.copy!(x::Vector, h::HYPREVector)
     ilower, iupper = Internals.get_proc_rows(h)
     nvalues = iupper - ilower + 1
diff --git a/test/runtests.jl b/test/runtests.jl
index 21e67a3..8bf873c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -52,10 +52,16 @@ end
     CSC = sprand(5, 10, 0.3)
     CSR = sparsecsr(findnz(CSC)..., size(CSC)...)
     @test CSC == CSR
-    H = HYPREMatrix(CSC, ilower,  iupper)
+    H = HYPREMatrix(CSC, ilower, iupper)
     @test H.IJMatrix != HYPRE_IJMatrix(C_NULL)
     @test H.ParCSRMatrix != HYPRE_ParCSRMatrix(C_NULL)
-    H = HYPREMatrix(CSR, ilower,  iupper)
+    H = HYPREMatrix(MPI.COMM_WORLD, CSC, ilower, iupper)
+    @test H.IJMatrix != HYPRE_IJMatrix(C_NULL)
+    @test H.ParCSRMatrix != HYPRE_ParCSRMatrix(C_NULL)
+    H = HYPREMatrix(CSR, ilower, iupper)
+    @test H.IJMatrix != HYPRE_IJMatrix(C_NULL)
+    @test H.ParCSRMatrix != HYPRE_ParCSRMatrix(C_NULL)
+    H = HYPREMatrix(MPI.COMM_WORLD, CSR, ilower,  iupper)
     @test H.IJMatrix != HYPRE_IJMatrix(C_NULL)
     @test H.ParCSRMatrix != HYPRE_ParCSRMatrix(C_NULL)
 end
@@ -182,6 +188,9 @@ end
     h = HYPREVector(b, ilower, iupper)
     @test h.IJVector != HYPRE_IJVector(C_NULL)
     @test h.ParVector != HYPRE_ParVector(C_NULL)
+    h = HYPREVector(MPI.COMM_WORLD, b, ilower, iupper)
+    @test h.IJVector != HYPRE_IJVector(C_NULL)
+    @test h.ParVector != HYPRE_ParVector(C_NULL)
     @test_throws ArgumentError HYPREVector([1, 2], ilower, iupper)
 
     ilower, iupper = 1, 10