Index: openmp/runtime/src/kmp_tasking.cpp
===================================================================
--- openmp/runtime/src/kmp_tasking.cpp
+++ openmp/runtime/src/kmp_tasking.cpp
@@ -1328,7 +1328,7 @@
 
   taskdata->td_flags.task_serial =
       (parent_task->td_flags.final || taskdata->td_flags.team_serial ||
-       taskdata->td_flags.tasking_ser);
+       taskdata->td_flags.tasking_ser || flags->task_serial);
 
   taskdata->td_flags.started = 0;
   taskdata->td_flags.executing = 0;