diff --git a/libs/community/langchain_community/tools/sql_database/tool.py b/libs/community/langchain_community/tools/sql_database/tool.py
index 2981f09eae4..fa055a5a145 100644
--- a/libs/community/langchain_community/tools/sql_database/tool.py
+++ b/libs/community/langchain_community/tools/sql_database/tool.py
@@ -79,7 +79,7 @@ class InfoSQLDatabaseTool(BaseSQLDatabaseTool, BaseTool):
 
 
 class _ListSQLDataBaseToolInput(BaseModel):
-    tool_input: str = Field(..., description="An empty string")
+    tool_input: str = Field("", description="An empty string")
 
 
 class ListSQLDatabaseTool(BaseSQLDatabaseTool, BaseTool):