diff --git a/lib/client/new_job_window.py b/lib/client/new_job_window.py
index 75ea5ce..979313e 100755
--- a/lib/client/new_job_window.py
+++ b/lib/client/new_job_window.py
@@ -160,7 +160,7 @@ class NewJobWindow(Frame):
 
         self.fetch_server_data()
 
-    def client_picked(self):
+    def client_picked(self, event=None):
         self.server_proxy.hostname = self.client_combo.get()
         self.fetch_server_data()