diff --git a/frappe/core/doctype/file/file.py b/frappe/core/doctype/file/file.py
index d6923c0010..c4c37e6d13 100755
--- a/frappe/core/doctype/file/file.py
+++ b/frappe/core/doctype/file/file.py
@@ -912,7 +912,7 @@ def extract_images_from_html(doc, content):
 		return '<img src="{file_url}"'.format(file_url=file_url)
 
 	if content and isinstance(content, string_types):
-		content = re.sub('<img[^>]*src\s*=\s*["\'](?=data:)(.*?)["\']', _save_file, content)
+		content = re.sub(r'<img[^>]*src\s*=\s*["\'](?=data:)(.*?)["\']', _save_file, content)
 
 	return content