diff --git a/marker/config/printer.py b/marker/config/printer.py
index 2c728553..bb9890f5 100644
--- a/marker/config/printer.py
+++ b/marker/config/printer.py
@@ -41,7 +41,7 @@ def parse_args(self, ctx, args):
                         ["--" + attr],
                         type=info['type'],
                         help=" ".join(info['metadata']) + f" (Applies to: {', '.join(info['classes'])})",
-                        default=info['default'],
+                        default=None, # This is important, or it sets all the default keys again in config
                         is_flag=info['is_flag'],
                     )
                 )
@@ -71,6 +71,7 @@ def parse_args(self, ctx, args):
                                 type=attr_type,
                                 help=" ".join(metadata),
                                 is_flag=is_flag,
+                                default=None # This is important, or it sets all the default keys again in config
                             )
                         )
 
diff --git a/marker/scripts/convert.py b/marker/scripts/convert.py
index d6b09833..f9910c4e 100644
--- a/marker/scripts/convert.py
+++ b/marker/scripts/convert.py
@@ -63,12 +63,12 @@ def process_single_pdf(args):
 
 @click.command(cls=CustomClickPrinter)
 @click.argument("in_folder", type=str)
-@ConfigParser.common_options
 @click.option("--chunk_idx", type=int, default=0, help="Chunk index to convert")
 @click.option("--num_chunks", type=int, default=1, help="Number of chunks being processed in parallel")
 @click.option("--max_files", type=int, default=None, help="Maximum number of pdfs to convert")
 @click.option("--workers", type=int, default=5, help="Number of worker processes to use.")
 @click.option("--skip_existing", is_flag=True, default=False, help="Skip existing converted files.")
+@ConfigParser.common_options
 def convert_cli(in_folder: str, **kwargs):
     in_folder = os.path.abspath(in_folder)
     files = [os.path.join(in_folder, f) for f in os.listdir(in_folder)]
@@ -86,7 +86,7 @@ def convert_cli(in_folder: str, **kwargs):
         files_to_convert = files_to_convert[:kwargs["max_files"]]
 
     # Disable nested multiprocessing
-    kwargs["pdftext_workers"] = 1
+    kwargs["disable_multiprocessing"] = True
 
     total_processes = min(len(files_to_convert), kwargs["workers"])
 
diff --git a/tests/config/test_config.py b/tests/config/test_config.py
new file mode 100644
index 00000000..7458c070
--- /dev/null
+++ b/tests/config/test_config.py
@@ -0,0 +1,36 @@
+import sys
+from contextlib import suppress
+from marker.config.parser import ConfigParser
+
+import click
+
+from marker.config.printer import CustomClickPrinter
+
+
+def test_config_parser():
+    command = click.command(cls=CustomClickPrinter)
+    captured_kwargs = {}
+
+    def parse_args(**kwargs):
+        captured_kwargs.update(kwargs)
+        return kwargs
+
+    original_argv = sys.argv
+    sys.argv = ['test', '--disable_multiprocessing', '--output_dir', 'output_dir', "--height_tolerance", "0.5"]
+    try:
+        with suppress(SystemExit):
+            command(ConfigParser.common_options(parse_args))()
+    finally:
+        sys.argv = original_argv
+
+    kwargs = captured_kwargs
+    parser = ConfigParser(kwargs)
+    config_dict = parser.generate_config_dict()
+
+    # Validate kwarg capturing
+    assert captured_kwargs["disable_multiprocessing"] == True
+    assert captured_kwargs["output_dir"] == "output_dir"
+
+    assert config_dict["pdftext_workers"] == 1 # disabling multiprocessing does this
+    assert config_dict["height_tolerance"] == 0.5
+    assert "output_dir" not in config_dict # This is not a config key
\ No newline at end of file