diff --git a/taiga/export_import/serializers.py b/taiga/export_import/serializers.py
index 25a18944..cee2dc9a 100644
--- a/taiga/export_import/serializers.py
+++ b/taiga/export_import/serializers.py
@@ -324,6 +324,7 @@ class RoleExportSerializer(serializers.ModelSerializer):
 class MembershipExportSerializer(serializers.ModelSerializer):
     user = UserRelatedField(required=False)
     role = ProjectRelatedField(slug_field="name")
+    invited_by = UserRelatedField(required=False)
 
     class Meta:
         model = projects_models.Membership