diff --git a/rtabmap_examples/launch/realsense_d435i_color.launch.py b/rtabmap_examples/launch/realsense_d435i_color.launch.py
index 8aa86aaa7..276673ea1 100644
--- a/rtabmap_examples/launch/realsense_d435i_color.launch.py
+++ b/rtabmap_examples/launch/realsense_d435i_color.launch.py
@@ -37,7 +37,7 @@ def generate_launch_description():
             PythonLaunchDescriptionSource([os.path.join(
                 get_package_share_directory('realsense2_camera'), 'launch'),
                 '/rs_launch.py']),
-                launch_arguments={'camera_namespace': "",
+                launch_arguments={'camera_namespace': '',
                                   'enable_gyro': 'true',
                                   'enable_accel': 'true',
                                   'unite_imu_method': '2',
diff --git a/rtabmap_examples/launch/realsense_d435i_infra.launch.py b/rtabmap_examples/launch/realsense_d435i_infra.launch.py
index e440c13d9..91013e212 100644
--- a/rtabmap_examples/launch/realsense_d435i_infra.launch.py
+++ b/rtabmap_examples/launch/realsense_d435i_infra.launch.py
@@ -37,7 +37,7 @@ def generate_launch_description():
             PythonLaunchDescriptionSource([os.path.join(
                 get_package_share_directory('realsense2_camera'), 'launch'),
                 '/rs_launch.py']),
-                launch_arguments={'camera_namespace': "",
+                launch_arguments={'camera_namespace': '',
                                   'enable_gyro': 'true',
                                   'enable_accel': 'true',
                                   'unite_imu_method': '2',
diff --git a/rtabmap_examples/launch/realsense_d435i_stereo.launch.py b/rtabmap_examples/launch/realsense_d435i_stereo.launch.py
index 775e26a6f..944f96373 100644
--- a/rtabmap_examples/launch/realsense_d435i_stereo.launch.py
+++ b/rtabmap_examples/launch/realsense_d435i_stereo.launch.py
@@ -37,7 +37,7 @@ def generate_launch_description():
             PythonLaunchDescriptionSource([os.path.join(
                 get_package_share_directory('realsense2_camera'), 'launch'),
                 '/rs_launch.py']),
-                launch_arguments={'camera_namespace': "",
+                launch_arguments={'camera_namespace': '',
                                   'enable_gyro': 'true',
                                   'enable_accel': 'true',
                                   'unite_imu_method': '2',