diff --git a/src/psij/job_attributes.py b/src/psij/job_attributes.py
index 91fcd02b..d060fa30 100644
--- a/src/psij/job_attributes.py
+++ b/src/psij/job_attributes.py
@@ -53,7 +53,8 @@ def __init__(self, duration: timedelta = timedelta(minutes=10),
         self.account = account
         self.duration = duration
         self.queue_name = queue_name
-        self.project_name = project_name
+        if project_name is not None:
+            self.project_name = project_name
         self.reservation_id = reservation_id
         self._custom_attributes = custom_attributes