diff --git a/clitools/generators/dummy.py b/clitools/generators/dummy.py
index ef621c6..d827ff3 100644
--- a/clitools/generators/dummy.py
+++ b/clitools/generators/dummy.py
@@ -42,7 +42,7 @@ debug(name+" optimal looptime "+str(optimal_looptime))
 while True:
   start = time.time()
   #print("[(100.0, 100.0, 65280), (100.0, 500.0, 65280), (500.0, 500.0, 65280), (500.0, 100.0, 65280), (100.0, 100.0, 65280)]", flush=True);
-  print("[(100.0, 100.0, 65280), (110.0, 500.0, 65280), (510.0, 500.0, 65280), (510.0, 100.0, 65280), (100.0, 110.0, 65280)]", flush=True);
+  print("[[100.0, 100.0, 65280], [110.0, 500.0, 65280], [510.0, 500.0, 65280], [510.0, 100.0, 65280], [100.0, 110.0, 65280]]", flush=True);
   looptime = time.time() - start
   if( looptime < optimal_looptime ):
     time.sleep( optimal_looptime - looptime)