diff --git a/Src/GroupTree/FGroupTaskStarpuMpiAlgorithm.hpp b/Src/GroupTree/FGroupTaskStarpuMpiAlgorithm.hpp
index a57b21bec1b971fde6b1907efffd3484fbc9734c..de287a5dc496dd422f16a3797259ff08bdecfd19 100644
--- a/Src/GroupTree/FGroupTaskStarpuMpiAlgorithm.hpp
+++ b/Src/GroupTree/FGroupTaskStarpuMpiAlgorithm.hpp
@@ -130,6 +130,8 @@ public:
         buildExternalInteractionVecs();
         buildHandles();
 
+        #pragma omp parallel
+        #pragma omp single
         buildRemoteInteractionsAndHandles();
         postRecvAllocatedBlocks();