diff --git a/patches/march_2013/p11_update_attach_files.py b/patches/march_2013/p11_update_attach_files.py
index 769463a..ef39ce8 100644
--- a/patches/march_2013/p11_update_attach_files.py
+++ b/patches/march_2013/p11_update_attach_files.py
@@ -11,6 +11,6 @@
 		else:
 			webnotes.conn.sql("""update `tab%(parent)s`
 				set %(fieldname)s = 
-					if(substr(%(fieldname)s,0,4)='http' or substr(%(fieldname)s, 0, 5)='files',
+					if(substr(%(fieldname)s,1,4)='http' or substr(%(fieldname)s,1,5)='files',
 					 	%(fieldname)s, 
 						concat('files/', %(fieldname)s))""" % f)
\ No newline at end of file