diff --git a/erpnext/patches/jan_mar_2012/label_cleanup.py b/erpnext/patches/jan_mar_2012/label_cleanup.py
index 93536fa..b40f36f 100644
--- a/erpnext/patches/jan_mar_2012/label_cleanup.py
+++ b/erpnext/patches/jan_mar_2012/label_cleanup.py
@@ -33,10 +33,10 @@
 	}
 
 	for d in del_flds:
-		webnotes.conn.sql("delete from `tabDocField` where fieldname in (%s) and parent = %s", (del_flds[d], d))
+		webnotes.conn.sql("delete from `tabDocField` where fieldname in (%s) and parent = '%s'"% (del_flds[d], d))
 
 	for d in del_labels:
-		webnotes.conn.sql("delete from `tabDocField` where label in (%s) and parent = %s", (del_labels[d], d))
+		webnotes.conn.sql("delete from `tabDocField` where label in (%s) and parent = '%s'"% (del_labels[d], d))
 
 	delete_doc('DocType', 'Update Delivery Date Detail')