diff --git a/src/event/SocketMonitor.cxx b/src/event/SocketMonitor.cxx
index e0adfb05a..0d8c326c3 100644
--- a/src/event/SocketMonitor.cxx
+++ b/src/event/SocketMonitor.cxx
@@ -63,15 +63,6 @@ SocketMonitor::Steal() noexcept
 	return std::exchange(fd, SocketDescriptor::Undefined());
 }
 
-void
-SocketMonitor::Abandon() noexcept
-{
-	assert(IsDefined());
-
-	loop.Abandon(std::exchange(fd, SocketDescriptor::Undefined()).Get(),
-		     *this);
-}
-
 void
 SocketMonitor::Close() noexcept
 {
diff --git a/src/event/SocketMonitor.hxx b/src/event/SocketMonitor.hxx
index c07813c2a..e3922e155 100644
--- a/src/event/SocketMonitor.hxx
+++ b/src/event/SocketMonitor.hxx
@@ -91,11 +91,6 @@ public:
 	 */
 	SocketDescriptor Steal() noexcept;
 
-	/**
-	 * Somebody has closed the socket.  Unregister this object.
-	 */
-	void Abandon() noexcept;
-
 	void Close() noexcept;
 
 	unsigned GetScheduledFlags() const noexcept {