diff --git a/src/backend/backup/basebackup_progress.c b/src/backend/backup/basebackup_progress.c
index 4af247b4887..bdaf09cfe3f 100644
--- a/src/backend/backup/basebackup_progress.c
+++ b/src/backend/backup/basebackup_progress.c
@@ -242,3 +242,15 @@ basebackup_progress_transfer_wal(void)
 	pgstat_progress_update_param(PROGRESS_BASEBACKUP_PHASE,
 								 PROGRESS_BASEBACKUP_PHASE_TRANSFER_WAL);
 }
+
+/*
+ * Advertise that we are no longer performing a backup.
+ *
+ * No longer used in core, but kept to preserve ABI compatibility in this
+ * branch.
+ */
+void
+basebackup_progress_done(void)
+{
+	pgstat_progress_end_command();
+}
diff --git a/src/include/backup/basebackup_sink.h b/src/include/backup/basebackup_sink.h
index 272fafd1c4b..fcedba75a65 100644
--- a/src/include/backup/basebackup_sink.h
+++ b/src/include/backup/basebackup_sink.h
@@ -296,5 +296,6 @@ extern void basebackup_progress_wait_checkpoint(void);
 extern void basebackup_progress_estimate_backup_size(void);
 extern void basebackup_progress_wait_wal_archive(bbsink_state *);
 extern void basebackup_progress_transfer_wal(void);
+extern void basebackup_progress_done(void);
 
 #endif