diff --git a/hepdata_lib/__init__.py b/hepdata_lib/__init__.py
index 2613a81c..c1fc9f87 100644
--- a/hepdata_lib/__init__.py
+++ b/hepdata_lib/__init__.py
@@ -55,7 +55,7 @@ def __init__(self):
         self.files_to_copy = []
         self.additional_resources = []
 
-    def add_additional_resource(self, description, location, copy_file=False, file_type=None,
+    def add_additional_resource(self, description, location, *, copy_file=False, file_type=None,
                                 resource_license=None):
         """
         Add any kind of additional resource.
@@ -143,7 +143,7 @@ class Variable:
     # pylint: disable=too-many-instance-attributes
     # Eight is reasonable in this case.
 
-    def __init__(self, name, is_independent=True, is_binned=True, units="", values=None,
+    def __init__(self, name, *, is_independent=True, is_binned=True, units="", values=None,
                  zero_uncertainties_warning=True):
         # pylint: disable=too-many-arguments
         self.name = name
diff --git a/tests/test_submission.py b/tests/test_submission.py
index 6bee2c01..8a9373ce 100644
--- a/tests/test_submission.py
+++ b/tests/test_submission.py
@@ -157,7 +157,7 @@ def test_nested_files_to_copy(self):
         # Add resource to table, add table to Submission
         sub = Submission()
         tab = Table('test')
-        tab.add_additional_resource("a_resource",testfile,True)
+        tab.add_additional_resource("a_resource",testfile, copy_file=True)
         sub.add_table(tab)
 
         # Write outputs
diff --git a/tests/test_table.py b/tests/test_table.py
index 1fa434f9..fd06d81f 100644
--- a/tests/test_table.py
+++ b/tests/test_table.py
@@ -265,7 +265,10 @@ def test_add_additional_resource_license_check(self):
         some_pdf = f"{os.path.dirname(__file__)}/minimal.pdf"
 
         # Set default description, location, copy_file and file_type arguments for a resource file
-        resource_args = ["Description", some_pdf, True, "Type"]
+        description = "Description"
+        location = some_pdf
+        copy_file = True
+        file_type = "Type"
 
         for data in license_data:
             # If error is expected, we check for the error
@@ -273,14 +276,14 @@ def test_add_additional_resource_license_check(self):
             if data["error"]:
                 with self.assertRaises(ValueError):
                     test_table.add_additional_resource(
-                        *resource_args,
+                        description, location, copy_file=copy_file, file_type=file_type,
                         resource_license=data["license_data"]
                     )
             else:
                 # Check for lack of failure
                 try:
                     test_table.add_additional_resource(
-                        *resource_args,
+                        description, location, copy_file=copy_file, file_type=file_type,
                         resource_license=data["license_data"]
                     )
                 except ValueError: