diff --git a/OBIA/OBIABase.py b/OBIA/OBIABase.py
index b43aed4dfb7db8954fca4ff032d45e6f7ac4274a..62011d3c0b862e24715435aad68d295dba8f2326 100644
--- a/OBIA/OBIABase.py
+++ b/OBIA/OBIABase.py
@@ -234,7 +234,7 @@ class OBIABase:
         with rio.open(raster_file) as ds:
             n_bands = ds.count
         ds = None
-        to_append = [raster_name + '_{}_{}'.format(i+1,j.value) for i in range(n_bands) for j in stats]
+        to_append = ['var_{}_'.format(self.n_vars + i) + raster_name + '_{}_{}'.format(i+1,j.value) for i in range(n_bands) for j in stats]
         if as_group:
             self.raster_groups.extend(range(self.n_vars, self.n_vars+len(to_append)))
         self.raster_var_names.append(to_append)