diff --git a/launch/gazebo_ardrone_empty_world.launch b/launch/gazebo_ardrone_empty_world.launch
index d04991f19c..9d19fe5f9a 100644
--- a/launch/gazebo_ardrone_empty_world.launch
+++ b/launch/gazebo_ardrone_empty_world.launch
@@ -1,6 +1,18 @@
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diff --git a/launch/gazebo_ardrone_house_world.launch b/launch/gazebo_ardrone_house_world.launch
index d1bb2043aa..c636868eb2 100644
--- a/launch/gazebo_ardrone_house_world.launch
+++ b/launch/gazebo_ardrone_house_world.launch
@@ -1,6 +1,18 @@
-
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diff --git a/launch/gazebo_iris_empty_world.launch b/launch/gazebo_iris_empty_world.launch
index d69b7d0069..8a4c128b90 100644
--- a/launch/gazebo_iris_empty_world.launch
+++ b/launch/gazebo_iris_empty_world.launch
@@ -1,6 +1,18 @@
-
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diff --git a/launch/gazebo_iris_house_world.launch b/launch/gazebo_iris_house_world.launch
index 2e88e157c9..e4f9f6532c 100644
--- a/launch/gazebo_iris_house_world.launch
+++ b/launch/gazebo_iris_house_world.launch
@@ -1,6 +1,18 @@
-
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diff --git a/launch/gazebo_iris_outdoor_world.launch b/launch/gazebo_iris_outdoor_world.launch
index a1df06496b..22d55502d3 100644
--- a/launch/gazebo_iris_outdoor_world.launch
+++ b/launch/gazebo_iris_outdoor_world.launch
@@ -1,6 +1,18 @@
-
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