diff --git a/runtime/starpu/codelets/codelet_dataflush.c b/runtime/starpu/codelets/codelet_dataflush.c
index 1debb4b6701d149c35d22874f457a4a863145f88..b86b9521896b8546a9d22df8b7148fe7b233b373 100644
--- a/runtime/starpu/codelets/codelet_dataflush.c
+++ b/runtime/starpu/codelets/codelet_dataflush.c
@@ -56,7 +56,7 @@ void MORSE_TASK_dataflush(MORSE_option_t *options,
 
         if (*ptrtile != NULL)
         {
-#if defined(CHAMELEON_USE_MPI)
+#if defined(CHAMELEON_USE_MPI) && !defined(CHAMELEON_SIMULATION)
             starpu_mpi_cache_flush(MPI_COMM_WORLD, *ptrtile);
 #endif
 
@@ -77,7 +77,7 @@ void MORSE_TASK_dataflush(MORSE_option_t *options,
 
 void MORSE_TASK_dataflush_all()
 {
-#if defined(CHAMELEON_USE_MPI)
+#if defined(CHAMELEON_USE_MPI) && !defined(CHAMELEON_SIMULATION)
     starpu_mpi_cache_flush_all_data(MPI_COMM_WORLD);
 #endif
 }