diff --git a/samples/ReadPropertyMultiple.py b/samples/ReadPropertyMultiple.py
index 9a9d9290..a539a576 100755
--- a/samples/ReadPropertyMultiple.py
+++ b/samples/ReadPropertyMultiple.py
@@ -206,6 +206,9 @@ def do_read(self, args):
 #
 
 def main():
+    global this_application
+    global this_device
+    global this_console
     # parse the command line arguments
     args = ConfigArgumentParser(description=__doc__).parse_args()