diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 019ae6a6536..11f06ea6cae 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -62,7 +62,6 @@
 #include "replication/slot.h"
 #include "replication/snapbuild.h"
 #include "replication/syncrep.h"
-#include "replication/slot.h"
 #include "replication/walreceiver.h"
 #include "replication/walsender.h"
 #include "replication/walsender_private.h"