diff --git a/test/runtests.jl b/test/runtests.jl
index b6baa88..22079e5 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -10,6 +10,8 @@ using SparseArrays
 using SparseMatricesCSR
 using Test
 
+Base.convert(::Type{Int32}, comm::MPI.Comm) = comm.val
+
 # Init HYPRE and MPI
 HYPRE.Init()