diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index 1c6c0c7ce2..e4f5c6fb36 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -512,7 +512,7 @@ ReplicationSlotRelease(void)
 	MyReplicationSlot = NULL;
 
 	/* might not have been set when we've been a plain slot */
-	LWLockAcquire(ProcArrayLock, LW_SHARED);
+	LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
 	MyProc->statusFlags &= ~PROC_IN_LOGICAL_DECODING;
 	ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
 	LWLockRelease(ProcArrayLock);