I'm not sure if this would apply to your situation but, you might consider taking a different approach and setting up a database trigger which logs any procedure updates to a table:

CREATE trigger [dbtrg_ChangeLog]

on database

for create_procedure, alter_procedure, drop_procedure

as

set nocount on

declare @data xml

set @data = EVENTDATA()

INSERT INTO changelog(databasename, eventtype, objectname, objecttype, sqlcommand, loginname)

VALUES(

@data.value('(/EVENT_INSTANCE/DatabaseName)[1]', 'varchar(256)'),

@data.value('(/EVENT_INSTANCE/EventType)[1]', 'varchar(50)'),

@data.value('(/EVENT_INSTANCE/ObjectName)[1]', 'varchar(256)'),

@data.value('(/EVENT_INSTANCE/ObjectType)[1]', 'varchar(25)'),

@data.value('(/EVENT_INSTANCE/TSQLCommand)[1]', 'varchar(max)'),

@data.value('(/EVENT_INSTANCE/LoginName)[1]', 'varchar(256)')

)