diff --git a/apps/mtm/serializers.py b/apps/mtm/serializers.py
index 1db70d3a..7123b3f1 100644
--- a/apps/mtm/serializers.py
+++ b/apps/mtm/serializers.py
@@ -34,7 +34,7 @@ class MaterialSerializer(CustomModelSerializer):
     class Meta:
         model = Material
         fields = '__all__'
-        read_only_fields = EXCLUDE_FIELDS
+        read_only_fields = EXCLUDE_FIELDS + ['count']
 
     def get_full_name(self, obj):
         return f'{obj.name}|{obj.specification if obj.specification else ""}|{obj.model if obj.model else ""}|{obj.process.name if obj.process else ""}'