diff --git a/src/event/MultiSocketMonitor.hxx b/src/event/MultiSocketMonitor.hxx
index 1ce2373d3..11308d505 100644
--- a/src/event/MultiSocketMonitor.hxx
+++ b/src/event/MultiSocketMonitor.hxx
@@ -84,8 +84,6 @@ class MultiSocketMonitor : IdleMonitor
 		}
 	};
 
-	friend class SingleFD;
-
 	TimerEvent timeout_event;
 
 	/**