diff --git a/clients/rospy/src/rospy/impl/rosout.py b/clients/rospy/src/rospy/impl/rosout.py
index 4514031809..a827e1c827 100644
--- a/clients/rospy/src/rospy/impl/rosout.py
+++ b/clients/rospy/src/rospy/impl/rosout.py
@@ -95,7 +95,7 @@ def _rosout(level, msg, fname, line, func):
                         disable_topics_ = False
 
                     if not disable_topics_:
-                        topics = get_topic_manager().get_topics()
+                        topics = get_topic_manager().get_topics().copy()
                     else:
                         topics = ""