Dom m, Mim m

[j-f.stephant]

Bonjour

I wish to obtain on my partition:  MIb Dom Re Mim
I give him the 6 following lines: 
The result is:  MIb Dom m Re Mim m
Where was I mistaken?  Thank you

    harmonies = \chordmode {
      ees4  c4:m  d4 e4:m     }
       \context ChordNames {
        \set instrument = #"italian"
       \italianChords
            \harmonies        }

Merci

Jacques