diff --git a/p2p/base/port_allocator.h b/p2p/base/port_allocator.h
index c1d583f..78b0c70 100644
--- a/p2p/base/port_allocator.h
+++ b/p2p/base/port_allocator.h
@@ -283,7 +283,6 @@
 
   virtual uint32_t generation();
   virtual void set_generation(uint32_t generation);
-  sigslot::signal1<PortAllocatorSession*> SignalDestroyed;
 
  protected:
   // This method is called when a pooled session (which doesn't have these