diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 34f2fc0..fc42b5f 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -163,7 +163,7 @@ HotStandbyState standbyState = STANDBY_DISABLED;
 static XLogRecPtr LastRec;
 
 /* Local copy of WalRcv->receivedUpto */
-static XLogRecPtr receivedUpto = 0;
+static XLogRecPtr receivedUpto = LowestXLogRecPtr;
 static TimeLineID receiveTLI = 0;
 
 /*
@@ -11003,7 +11003,7 @@ WaitForWALToBecomeAvailable(XLogRecPtr RecPtr, bool randAccess,
 						curFileTLI = tli;
 						RequestXLogStreaming(tli, ptr, PrimaryConnInfo,
 											 PrimarySlotName);
-						receivedUpto = 0;
+						receivedUpto = LowestXLogRecPtr;
 					}
 
 					/*
@@ -11266,7 +11266,7 @@ WaitForWALToBecomeAvailable(XLogRecPtr RecPtr, bool randAccess,
 static int
 emode_for_corrupt_record(int emode, XLogRecPtr RecPtr)
 {
-	static XLogRecPtr lastComplaint = 0;
+	static XLogRecPtr lastComplaint = LowestXLogRecPtr;
 
 	if (readSource == XLOG_FROM_PG_XLOG && emode == LOG)
 	{
diff --git a/src/backend/replication/walreceiver.c b/src/backend/replication/walreceiver.c
index c2d4ed3..c5103f7 100644
--- a/src/backend/replication/walreceiver.c
+++ b/src/backend/replication/walreceiver.c
@@ -1037,8 +1037,8 @@ XLogWalRcvFlush(bool dying)
 static void
 XLogWalRcvSendReply(bool force, bool requestReply)
 {
-	static XLogRecPtr writePtr = 0;
-	static XLogRecPtr flushPtr = 0;
+	static XLogRecPtr writePtr = InvalidXLogRecPtr;
+	static XLogRecPtr flushPtr = InvalidXLogRecPtr;
 	XLogRecPtr	applyPtr;
 	static TimestampTz sendTime = 0;
 	TimestampTz now;
diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 844a5de..819ac28 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -140,7 +140,7 @@ static XLogRecPtr sendTimeLineValidUpto = InvalidXLogRecPtr;
  * How far have we sent WAL already? This is also advertised in
  * MyWalSnd->sentPtr.  (Actually, this is the next WAL location to send.)
  */
-static XLogRecPtr sentPtr = 0;
+static XLogRecPtr sentPtr = LowestXLogRecPtr;
 
 /* Buffers for constructing outgoing messages and processing reply messages. */
 static StringInfoData output_message;
diff --git a/src/include/access/xlogdefs.h b/src/include/access/xlogdefs.h
index 3b8e738..f7d88b4 100644
--- a/src/include/access/xlogdefs.h
+++ b/src/include/access/xlogdefs.h
@@ -25,9 +25,13 @@ typedef uint64 XLogRecPtr;
  * WAL segment, initializing the first WAL page at XLOG_SEG_SIZE, so no XLOG
  * record can begin at zero.
  */
-#define InvalidXLogRecPtr	0
+#define InvalidXLogRecPtr		((XLogRecPtr) 0)
 #define XLogRecPtrIsInvalid(r)	((r) == InvalidXLogRecPtr)
 
+/* Minimum value possible for a location pointer of XLOG */
+#define LowestXLogRecPtr		((XLogRecPtr) 0)
+#define XLogRecPtrIsLowest(r)	((r) == LowestXLogRecPtr)
+
 /*
  * XLogSegNo - physical log file sequence number.
  */