diff --git a/ros_gz_sim/launch/ros_gz_sim.launch.py b/ros_gz_sim/launch/ros_gz_sim.launch.py
index d0a68835..3f6690d2 100644
--- a/ros_gz_sim/launch/ros_gz_sim.launch.py
+++ b/ros_gz_sim/launch/ros_gz_sim.launch.py
@@ -34,7 +34,7 @@ def generate_launch_description():
     world_sdf_string = LaunchConfiguration('world_sdf_string')
 
     declare_config_file_cmd = DeclareLaunchArgument(
-        'config_file', default_value='', description='YAML config file'
+        'config_file', description='YAML config file'
     )
 
     declare_container_name_cmd = DeclareLaunchArgument(
diff --git a/ros_gz_sim/launch/ros_gz_spawn_model.launch.py b/ros_gz_sim/launch/ros_gz_spawn_model.launch.py
index 87dcb248..20e83bd7 100644
--- a/ros_gz_sim/launch/ros_gz_spawn_model.launch.py
+++ b/ros_gz_sim/launch/ros_gz_spawn_model.launch.py
@@ -44,7 +44,7 @@ def generate_launch_description():
     yaw = LaunchConfiguration('Y', default='0.0')
 
     declare_config_file_cmd = DeclareLaunchArgument(
-        'config_file', default_value='', description='YAML config file'
+        'config_file', description='YAML config file'
     )
 
     declare_container_name_cmd = DeclareLaunchArgument(