diff --git a/erpnext/website/doctype/style_settings/style_settings.py b/erpnext/website/doctype/style_settings/style_settings.py
index df650f2fc04..38716289a92 100644
--- a/erpnext/website/doctype/style_settings/style_settings.py
+++ b/erpnext/website/doctype/style_settings/style_settings.py
@@ -23,7 +23,7 @@ class DocType:
 		from jinja2 import Template
 		import os
 		
-		with open(os.path.dirname(__file__), 'custom_template.css'), 'r') as f:
+		with open(os.path.join(os.path.dirname(__file__), 'custom_template.css'), 'r') as f:
 			temp = Template(f.read())
 		
 		if not self.doc.font_size: