diff --git a/src/google/adk/tools/openapi_tool/openapi_spec_parser/operation_parser.py b/src/google/adk/tools/openapi_tool/openapi_spec_parser/operation_parser.py
index ace4746..a7bed0f 100644
--- a/src/google/adk/tools/openapi_tool/openapi_spec_parser/operation_parser.py
+++ b/src/google/adk/tools/openapi_tool/openapi_spec_parser/operation_parser.py
@@ -84,7 +84,7 @@ class OperationParser:
             description if not schema.description else schema.description
         )
         # param.required can be None
-        required = param.required if param.required else False
+        required = param.required if param.required is not None else False
 
         self.params.append(
             ApiParameter(