Hello, and welcome to OSM.

I am afraid to tell you that your change is misguided.

The official name in Dutch is "Bergense Steenweg" for the entire road across Anderlecht.  This name is written in two words on street signs as well as in the UrbIS database, which is the official reference for street names in the Brussels Region.

The "Bergensesteenweg" spelling is found in Sint-Pieters-Leeuw only, not in Brussels.

We will revert your change.