diff --git a/src/problem/Formulation.cpp b/src/problem/Formulation.cpp
index 59bbff9a78cb56baef74f6769867c8aeb728b154..6a7c015aa993a3fc61b1908c8e7d2716e8a287d7 100644
--- a/src/problem/Formulation.cpp
+++ b/src/problem/Formulation.cpp
@@ -822,6 +822,8 @@ namespace gmshddm
 
       const int outerVerbosity = gmshfem::common::Options::instance()->verbose;
       const int innerVerbosity = (outerVerbosity != 0 ? outerVerbosity - 1 : 0);
+  
+      const unsigned int MPI_Rank = mpi::getMPIRank();
 
       _physicalCommutator = true;
       _artificialCommutator = false;