diff --git a/src/tracing/agent.h b/src/tracing/agent.h
index 62073ba6b21..c2cd8281641 100644
--- a/src/tracing/agent.h
+++ b/src/tracing/agent.h
@@ -113,7 +113,6 @@ class Agent {
  private:
   friend class AgentWriterHandle;
 
-  static void ThreadCb(void* arg);
   void InitializeWritersOnThread();
 
   void Start();