diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h
index 8be8ab62a0..efcce5fdd5 100644
--- a/src/include/replication/slot.h
+++ b/src/include/replication/slot.h
@@ -144,7 +144,7 @@ typedef struct ReplicationSlotCtlData
  * Pointers to shared memory
  */
 extern ReplicationSlotCtlData *ReplicationSlotCtl;
-extern ReplicationSlot *MyReplicationSlot;
+extern PGDLLIMPORT ReplicationSlot *MyReplicationSlot;
 
 /* GUCs */
 extern PGDLLIMPORT int max_replication_slots;