diff --git a/api/core/app/app_config/entities.py b/api/core/app/app_config/entities.py
index d208db2b01dc29..7e5899bafabae8 100644
--- a/api/core/app/app_config/entities.py
+++ b/api/core/app/app_config/entities.py
@@ -92,7 +92,7 @@ class VariableEntityType(str, Enum):
     SELECT = "select"
     PARAGRAPH = "paragraph"
     NUMBER = "number"
-    EXTERNAL_DATA_TOOL = "external-data-tool"
+    EXTERNAL_DATA_TOOL = "external_data_tool"
 
 
 class VariableEntity(BaseModel):