diff --git a/10-task-pull-spawn.py b/10-task-pull-spawn.py
index 6d1a858..7083d97 100755
--- a/10-task-pull-spawn.py
+++ b/10-task-pull-spawn.py
@@ -51,7 +51,7 @@
         sys.stdout.flush()
 
     # Gather reports from workers
-    reports = comm.gather(root=MPI.ROOT)
+    reports = comm.gather(0, root=MPI.ROOT)
 
     # Print summary
     workers = 0; tasks = 0; time = 0
@@ -89,7 +89,7 @@
 
     # Ask for work until stop sentinel
     log = []
-    for task in iter(lambda: comm.sendrecv(dest=0), StopIteration):
+    for task in iter(lambda: comm.sendrecv(0, dest=0), StopIteration):
         log.append(task)
 
         # Do work (or not!)