diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index 2fb7c17d7d..0b2575ee9d 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -272,12 +272,22 @@ ReplicationSlotCreate(const char *name, bool db_specific,
 	 */
 	Assert(!slot->in_use);
 	Assert(slot->active_pid == 0);
-	slot->data.persistency = persistency;
-	slot->data.xmin = InvalidTransactionId;
-	slot->effective_xmin = InvalidTransactionId;
+
+	/* first initialize persistent data */
+	memset(&slot->data, 0, sizeof(ReplicationSlotPersistentData));
 	StrNCpy(NameStr(slot->data.name), name, NAMEDATALEN);
 	slot->data.database = db_specific ? MyDatabaseId : InvalidOid;
-	slot->data.restart_lsn = InvalidXLogRecPtr;
+	slot->data.persistency = persistency;
+
+	/* and then data only present in shared memory */
+	slot->just_dirtied = false;
+	slot->dirty = false;
+	slot->effective_xmin = InvalidTransactionId;
+	slot->effective_catalog_xmin = InvalidTransactionId;
+	slot->candidate_catalog_xmin = InvalidTransactionId;
+	slot->candidate_xmin_lsn = InvalidXLogRecPtr;
+	slot->candidate_restart_valid = InvalidXLogRecPtr;
+	slot->candidate_restart_lsn = InvalidXLogRecPtr;
 
 	/*
 	 * Create the slot on disk.  We haven't actually marked the slot allocated