Simple mod to deactivate decocker

After working with my presentations out of the holster with my FNX 9,i have found that i am accidentaly decocking about 25 percent of the time,ruinig my first shot placement.Since there seemed to be no simple way to internally deactivate this i fashioned a simple plastic stop and JB welded it on the frame just below the safety in the on position.I works well for me.Any one see a downside? With the exception of not having the use of the decocker,which i would never use. '
thanks