diff --git a/grudge/discretization.py b/grudge/discretization.py
index b218e56fa05b4429f3b597f5fbefe4ff01227ff1..dd8abf435afb82b5b9b4858931c5fda8e14bf099 100644
--- a/grudge/discretization.py
+++ b/grudge/discretization.py
@@ -137,7 +137,10 @@ class DGDiscretizationWithBoundaries:
             with MPIBoundaryCommSetupHelper(mpi_communicator, array_context,
                     connected_parts, local_boundary_connections,
                     grp_factory) as bdry_setup_helper:
-                while conns := bdry_setup_helper.complete_some():
+                while True:
+                    conns = bdry_setup_helper.complete_some()
+                    if not conns:
+                        break
                     for i_remote_part, conn in conns.items():
                         boundary_connections[i_remote_part] = conn