Enspelled Staff casting stat

Something that came up last night.  One of the players (me) pulled out a  Enspelled Staff of healing word to save healer that had dropped in your part.  When it came time to heal we realized that the  Enspelled Staff does not tell you modifier from the stat.  For the moment we just did the 2d4 to keep the game going and figured we would look it up.  when I did they give you the DC or attack (for level 1 13dc or +5 attack) but not the stat.  It looks like it should be set at a +3 making the healing 2d4+3.  what do you all think?

Yeah, RAW, if you don't have a spellcasting ability, then your spellcasting ability modifier is +0:

5e:

A magic item, such as certain staffs, may require you to use your own spellcasting ability when you cast a spell from the item. If you have more than one spellcasting ability, you choose which one to use with the item. If you don't have a spellcasting ability -- perhaps you're a rogue with the Use Magic Device feature -- your spellcasting ability modifier is +0 for the item, and your proficiency bonus does apply.

5.5e:

A magic item may require the user to use their own spellcasting ability when casting a spell from the item. If the user has more than one spellcasting ability, the user chooses which one to use with the item. If the user doesn’t have a spellcasting ability, their spellcasting ability modifier is +0 for the item, and the user’s Proficiency Bonus applies.

(As a side note, Magic Device differs between 5e and 5.5e)