We present the results of a long M87 monitoring campaign in very high energy \gamma -rays with the MAGIC-I Cherenkov telescope .
A total of 150 hours of data was gathered between 2005 and 2007 .
No flaring activity was found during that time .
Never the less , we have found an apparently steady and weak signal at the level of 7 \sigma .
We present the spectrum between 100 GeV and 2 TeV , which is consistent with a simple power law with a spectral index -2.21 \pm 0.21 and a flux normalization ( at 300 GeV ) of 5.4 \pm 1.1 \times 10 ^ { -8 } \frac { 1 } { \mathrm { TeVsm } ^ { 2 } } .
It complements well with the previously published Fermi spectrum , covering an energy range of four orders of magnitude without apparent change in the spectral index .