diff --git a/openlp/core/common/json.py b/openlp/core/common/json.py
index c323479e6..06a6f9eac 100644
--- a/openlp/core/common/json.py
+++ b/openlp/core/common/json.py
@@ -186,12 +186,12 @@ class PathSerializer(JSONMixin, register_names=('Path', 'PosixPath', 'WindowsPat
         return path
 
     @classmethod
-    def json_object(cls, obj, base_path=None, js_use=False, **kwargs):
+    def json_object(cls, obj, base_path=None, is_js=False, **kwargs):
         """
         Create a dictionary that can be JSON decoded.
 
         :param Path base_path: If specified, an absolute path to make a relative path from.
-        :param bool js_use: Encode the path as a uri. For example for use in the js rendering code.
+        :param bool is_js: Encode the path as a uri. For example for use in the js rendering code.
         :param kwargs: Contains any extra parameters. Not used!
         :return: The dictionary representation of this Path object.
         :rtype: dict[tuple]
@@ -200,7 +200,7 @@ class PathSerializer(JSONMixin, register_names=('Path', 'PosixPath', 'WindowsPat
         if base_path:
             with suppress(ValueError):
                 path = path.relative_to(base_path)
-        if js_use is True:
+        if is_js is True:
             return path.as_uri()
         json_dict = {'parts': path.parts}
         cls.attach_meta(json_dict)
diff --git a/openlp/core/display/window.py b/openlp/core/display/window.py
index e18437a4a..393b6ccce 100644
--- a/openlp/core/display/window.py
+++ b/openlp/core/display/window.py
@@ -332,9 +332,9 @@ class DisplayWindow(QtWidgets.QWidget):
             theme_copy = copy.deepcopy(theme)
             theme_copy.background_type = 'image'
             theme_copy.background_filename = self.checkerboard_path
-            exported_theme = theme_copy.export_theme(js_use=True)
+            exported_theme = theme_copy.export_theme(is_js=True)
         else:
-            exported_theme = theme.export_theme(js_use=True)
+            exported_theme = theme.export_theme(is_js=True)
         self.run_javascript('Display.setTheme({theme});'.format(theme=exported_theme))
 
     def get_video_types(self):
diff --git a/openlp/core/lib/theme.py b/openlp/core/lib/theme.py
index af40809bd..bc5ba69b8 100644
--- a/openlp/core/lib/theme.py
+++ b/openlp/core/lib/theme.py
@@ -225,18 +225,18 @@ class Theme(object):
             jsn = json.loads(theme, cls=OpenLPJSONDecoder)
         self.expand_json(jsn)
 
-    def export_theme(self, theme_path=None, js_use=False):
+    def export_theme(self, theme_path=None, is_js=False):
         """
         Loop through the fields and build a dictionary of them
 
         :param pathlib.Path | None theme_path:
-        :param bool js_use: For internal use, for example with the theme js code.
+        :param bool is_js: For internal use, for example with the theme js code.
         :return str: The json encoded theme object
         """
         theme_data = {}
         for attr, value in self.__dict__.items():
             theme_data["{attr}".format(attr=attr)] = value
-        return json.dumps(theme_data, cls=OpenLPJSONEncoder, base_path=theme_path, js_use=js_use)
+        return json.dumps(theme_data, cls=OpenLPJSONEncoder, base_path=theme_path, is_js=is_js)
 
     def parse(self, xml):
         """