diff --git a/src/omnibot/dummybot.py b/src/omnibot/dummybot.py
index 570a4da395e4430cf741695613807555b832e9ff..ab47eba11f984f145ed685b83e9d55de27c7813b 100644
--- a/src/omnibot/dummybot.py
+++ b/src/omnibot/dummybot.py
@@ -33,7 +33,7 @@ def run_dummybot(HOST,verbose=True):
 
             bot.set_speeds([-vset,-vset,-vset])
               
-            print('theta:'+bot.get_theta())
+            print('theta:'+str(bot.get_theta()))
 
             sleep(max(0,t0+ts-time()))