diff --git a/hb_server/apps/mtm/serializers.py b/hb_server/apps/mtm/serializers.py
index 3162536..3bf650f 100644
--- a/hb_server/apps/mtm/serializers.py
+++ b/hb_server/apps/mtm/serializers.py
@@ -50,7 +50,7 @@ class StepSimpleSerializer(serializers.ModelSerializer):
         fields = ['id', 'name', 'sort']
 
 class StepDetailSerializer(serializers.ModelSerializer):
-    equipments_ = EquipmentSimpleSerializer(source='equipments_', many=True)
+    equipments_ = EquipmentSimpleSerializer(source='equipments', many=True)
     class Meta:
         model = Step
         fields = '__all__'