diff --git a/src/backend/replication/syncrep.c b/src/backend/replication/syncrep.c
index 3d4a7508b4d0ce6f9b2ef60953eae216ff19ddb3..132d7e4a7a39ab8b482284910f8025a3de27fbc5 100644
--- a/src/backend/replication/syncrep.c
+++ b/src/backend/replication/syncrep.c
@@ -69,6 +69,7 @@ static int	SyncRepWaitMode = SYNC_REP_NO_WAIT;
 
 static void SyncRepQueueInsert(int mode);
 static void SyncRepCancelWait(void);
+static int	SyncRepWakeQueue(bool all, int mode);
 
 static int	SyncRepGetStandbyPriority(void);
 
@@ -529,7 +530,7 @@ SyncRepGetStandbyPriority(void)
  *
  * Must hold SyncRepLock.
  */
-int
+static int
 SyncRepWakeQueue(bool all, int mode)
 {
 	volatile WalSndCtlData *walsndctl = WalSndCtl;
diff --git a/src/include/replication/syncrep.h b/src/include/replication/syncrep.h
index 30e61c088446556cb95ff5dbe8126fcc02d41a04..6cb72eb21956a0a35048290a2f2359c322658bdc 100644
--- a/src/include/replication/syncrep.h
+++ b/src/include/replication/syncrep.h
@@ -47,9 +47,6 @@ extern void SyncRepReleaseWaiters(void);
 /* called by checkpointer */
 extern void SyncRepUpdateSyncStandbysDefined(void);
 
-/* called by various procs */
-extern int	SyncRepWakeQueue(bool all, int mode);
-
 extern bool check_synchronous_standby_names(char **newval, void **extra, GucSource source);
 extern void assign_synchronous_commit(int newval, void *extra);