diff --git a/FDTD/operator_mpi.cpp b/FDTD/operator_mpi.cpp
index f299205..22e7baa 100644
--- a/FDTD/operator_mpi.cpp
+++ b/FDTD/operator_mpi.cpp
@@ -36,7 +36,7 @@ Operator_MPI::Operator_MPI() : Operator_SSE_Compressed()
 	m_NumProc = MPI::COMM_WORLD.Get_size();
 
 	//enabled only if more than one process is active
-	m_MPI_Enabled = m_NumProc>0;
+	m_MPI_Enabled = m_NumProc>1;
 }
 
 Operator_MPI::~Operator_MPI()