diff --git a/src/event/PipeEvent.hxx b/src/event/PipeEvent.hxx
index 1db0e8df2..1df423f55 100644
--- a/src/event/PipeEvent.hxx
+++ b/src/event/PipeEvent.hxx
@@ -11,7 +11,9 @@
  * A variant of #SocketEvent for pipes (and other kinds of
  * #FileDescriptor which can be used with epoll).
  */
-class PipeEvent final {
+class PipeEvent final
+	: public EventPollBackendEvents
+{
 	SocketEvent event;
 
 public: