diff --git a/nomenclature/config.py b/nomenclature/config.py
index 11e94bbf..bd3e8d62 100644
--- a/nomenclature/config.py
+++ b/nomenclature/config.py
@@ -177,6 +177,8 @@ class DataStructureConfig(BaseModel):
 
     """
 
+    model: CodeListConfig = Field(default_factory=CodeListConfig)
+    scenario: CodeListConfig = Field(default_factory=CodeListConfig)
     region: RegionCodeListConfig = Field(default_factory=RegionCodeListConfig)
     variable: CodeListConfig = Field(default_factory=CodeListConfig)