diff --git a/frappe/core/doctype/file/file.py b/frappe/core/doctype/file/file.py
index 03701e5ba0..86e8e482d7 100755
--- a/frappe/core/doctype/file/file.py
+++ b/frappe/core/doctype/file/file.py
@@ -110,7 +110,7 @@ class File(NestedSet):
 		"""Returns folder size for current folder"""
 		if not folder:
 			folder = self.name
-		file_size =  frappe.db.sql("""select sum(ifnull(file_size,0))
+		file_size =  frappe.db.sql("""select ifnull(sum(file_size), 0)
 			from tabFile where folder=%s """, (folder))[0][0]
 
 		return file_size