diff --git a/src/databricks/sql/utils.py b/src/databricks/sql/utils.py
index 6b4868d2..f6ec3893 100644
--- a/src/databricks/sql/utils.py
+++ b/src/databricks/sql/utils.py
@@ -558,7 +558,7 @@ def infer_types(params: list[DbSqlParameter]):
             param.type = DbsqlDynamicDecimalType(cast_exp)
 
         if param.type == DbSqlType.VOID and param.value == None:
-            param.value = "NULL"
+            param.value = None
         else:
             param.value = str(param.value)
     return new_params