diff --git a/api/core/app/app_config/entities.py b/api/core/app/app_config/entities.py
index cbb382beb3..fdbbe6679a 100644
--- a/api/core/app/app_config/entities.py
+++ b/api/core/app/app_config/entities.py
@@ -97,6 +97,7 @@ class VariableEntityType(StrEnum):
     EXTERNAL_DATA_TOOL = "external_data_tool"
     FILE = "file"
     FILE_LIST = "file-list"
+    CHECKBOX = "checkbox"
 
 
 class VariableEntity(BaseModel):