diff --git a/webots_ros2/CHANGELOG.rst b/webots_ros2/CHANGELOG.rst
index 440fde748..74b3bec40 100644
--- a/webots_ros2/CHANGELOG.rst
+++ b/webots_ros2/CHANGELOG.rst
@@ -6,6 +6,7 @@ Changelog for package webots_ros2
 ------------------
 * Added support for painted point clouds.
 * Fixed ability to launch RViz without other tools in e-puck example.
+* Fixed command line arguments in importer tools.
 * Added new TIAGo project to webots_ros2_tiago to run real robot configuration.
 
 2023.0.3 (2023-04-12)
diff --git a/webots_ros2_importer/CHANGELOG.rst b/webots_ros2_importer/CHANGELOG.rst
index b0a18601e..991845a93 100644
--- a/webots_ros2_importer/CHANGELOG.rst
+++ b/webots_ros2_importer/CHANGELOG.rst
@@ -2,6 +2,10 @@
 Changelog for package webots_ros2_importer
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+2023.0.4 (2023-XX-XX)
+------------------
+* Fixed argument parsing
+
 2022.1.4 (2022-11-18)
 ------------------
 * Upgraded to urdf2webots 2.0.3
diff --git a/webots_ros2_importer/webots_ros2_importer/urdf2proto.py b/webots_ros2_importer/webots_ros2_importer/urdf2proto.py
index bbd7c4c7d..bf9bbdaac 100644
--- a/webots_ros2_importer/webots_ros2_importer/urdf2proto.py
+++ b/webots_ros2_importer/webots_ros2_importer/urdf2proto.py
@@ -24,7 +24,7 @@
 
 
 def main(args=None, urdfInput=None):
-    parser = argparse.ArgumentParser(usage='usage: %prog --input=my_robot.urdf [options]')
+    parser = argparse.ArgumentParser(usage='usage: %(prog)s --input=my_robot.urdf [options]')
     parser.add_argument('--input', dest='input', default='', help='Specifies the URDF file.')
     parser.add_argument('--output', dest='output', default='', help='Specifies the path and, if ending in ".proto", name '
                         'of the resulting PROTO file. The filename minus the .proto extension will be the robot name '
@@ -53,13 +53,13 @@ def main(args=None, urdfInput=None):
     # use 'parse_known_args' because ROS2 adds a lot of internal arguments
     arguments, _ = parser.parse_known_args()
     file = os.path.abspath(urdfInput) if urdfInput is not None else os.path.abspath(arguments.input)
-    if not arguments.input:
+    if not file:
         sys.exit('Input file not specified (should be specified with the "--input" argument).')
     if not os.path.isfile(file):
-        sys.exit('"%s" file does not exist.' % arguments.input)
+        sys.exit('"%s" file does not exist.' % file)
     elif not file.endswith('.urdf'):
         sys.exit('"%s" is not an urdf file.' % file)
-    convertUrdfFile(input=arguments.input,
+    convertUrdfFile(input=file,
                     output=arguments.output,
                     normal=arguments.normal,
                     boxCollision=arguments.boxCollision,
diff --git a/webots_ros2_importer/webots_ros2_importer/xacro2proto.py b/webots_ros2_importer/webots_ros2_importer/xacro2proto.py
index 938af4175..ddb72f0d9 100644
--- a/webots_ros2_importer/webots_ros2_importer/xacro2proto.py
+++ b/webots_ros2_importer/webots_ros2_importer/xacro2proto.py
@@ -24,7 +24,7 @@
 
 
 def main(args=None):
-    parser = argparse.ArgumentParser(usage='usage: %prog --input=my_robot.urdf.xacro [options]')
+    parser = argparse.ArgumentParser(usage='usage: %(prog)s --input=my_robot.urdf.xacro [options]')
     parser.add_argument('--input', dest='inFile', default=None,
                         help='Specifies the xacro file to convert.')
     parser.add_argument('--xacro-opts', dest='xacro_opts', default=None,
@@ -82,7 +82,7 @@ def main(args=None):
     # restore stdout and arguments and then run urdf to proto conversion
     sys.stdout = orig_stdout
     sys.argv = saved_argv
-    urdf2proto.main(input=path)
+    urdf2proto.main(urdfInput=path)
     os.remove(path)