diff --git a/src/google/adk/tools/google_search_tool.py b/src/google/adk/tools/google_search_tool.py
index d116e4b6c8e..9fe387df3ba 100644
--- a/src/google/adk/tools/google_search_tool.py
+++ b/src/google/adk/tools/google_search_tool.py
@@ -54,7 +54,7 @@ async def process_llm_request(
       llm_request.config.tools.append(
           types.Tool(google_search_retrieval=types.GoogleSearchRetrieval())
       )
-    elif llm_request.model and 'gemini-2' in llm_request.model:
+    elif llm_request.model and 'gemini-' in llm_request.model:
       llm_request.config.tools.append(
           types.Tool(google_search=types.GoogleSearch())
       )