diff --git a/src/genlab_bestilling/models.py b/src/genlab_bestilling/models.py
index 4314ef8..47db029 100644
--- a/src/genlab_bestilling/models.py
+++ b/src/genlab_bestilling/models.py
@@ -414,7 +414,7 @@ def populate_from_order(self):
 
             for marker in self.markers.all():
                 for sample in self.from_order.samples.filter(
-                    species__in=marker.species_set.all()
+                    species__in=marker.species.all()
                 ):
                     SampleMarkerAnalysis.objects.update_or_create(
                         sample=sample,