diff --git a/libs/wlgen/wlgen/rta.py b/libs/wlgen/wlgen/rta.py
index 96034cac1b5c716e537814c643edbe4ac9e1b13f..0599abee53849cb7d4db953896fcd1e7bbee86fa 100644
--- a/libs/wlgen/wlgen/rta.py
+++ b/libs/wlgen/wlgen/rta.py
@@ -426,7 +426,7 @@ class RTA(Workload):
                 self.rta_profile['tasks'][tid]['phases']\
                     ['p'+str(pid).zfill(6)] = task_phase
 
-                if phase.cpus:
+                if phase.cpus is not None:
                     if isinstance(phase.cpus, str):
                         task_phase['cpus'] = ranges_to_list(phase.cpus)
                     elif isinstance(phase.cpus, list):