diff --git a/browser_use/llm/google/chat.py b/browser_use/llm/google/chat.py
index d03b1b7d3..b00bb4d5c 100644
--- a/browser_use/llm/google/chat.py
+++ b/browser_use/llm/google/chat.py
@@ -199,7 +199,7 @@ class ChatGoogle(BaseChatModel):
 			config['seed'] = self.seed
 
 		if self.thinking_budget is None and 'gemini-2.5-flash' in self.model:
-			self.thinking_budget = 0
+			self.thinking_budget = -1
 
 		if self.thinking_budget is not None:
 			thinking_config_dict: types.ThinkingConfigDict = {'thinking_budget': self.thinking_budget}