diff --git a/bin/slave.py b/bin/slave.py
index 2ebb0db..3215570 100644
--- a/bin/slave.py
+++ b/bin/slave.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import sys
+import os
 import time
 
 from   multiprocessing.managers import BaseManager
@@ -63,7 +64,7 @@ if __name__ == '__main__':
   g = ggrid(input_file)
   g.q = np.array([exact(x) for x in g.verts])
 
-  myname = "%s-%d" % os.uname()[1], os.getpid())
+  myname = "%s-%d" % (os.uname()[1], os.getpid())
 
   shutdown = False
   while not shutdown: