diff --git a/OBIA/OBIABase.py b/OBIA/OBIABase.py
index 5b2e142383470cf754ddb526cde96bd74b8fa3ef..8faa01e385b23b2bf862be27815be01f75f6d317 100644
--- a/OBIA/OBIABase.py
+++ b/OBIA/OBIABase.py
@@ -144,7 +144,7 @@ class OBIABase:
                     out_stats[o.label].append(o.intensity_min)
                 if OStats.MAX in stats:
                     out_stats[o.label].append(o.intensity_max)
-                out_stats[o.label] = np.array(out_stats[o.label]).flatten()
+                out_stats[o.label] = np.array(out_stats[o.label]).flatten(order='F')
 
         if len(out_stats) > 0:
             return out_stats.keys(), np.vstack(list(out_stats.values()))