diff --git a/dace/libraries/mpi/nodes/comm_free.py b/dace/libraries/mpi/nodes/comm_free.py
index dfc9eaae70..7d375b62fa 100644
--- a/dace/libraries/mpi/nodes/comm_free.py
+++ b/dace/libraries/mpi/nodes/comm_free.py
@@ -21,7 +21,8 @@ def expansion(node, parent_state, parent_sdfg, n=None, **kwargs):
                                           node.in_connectors,
                                           node.out_connectors,
                                           code,
-                                          language=dace.dtypes.Language.CPP)
+                                          language=dace.dtypes.Language.CPP,
+                                          side_effects=True)
         return tasklet