diff --git a/pgxn/neon/libpagestore.c b/pgxn/neon/libpagestore.c
index d7507e69df..df92a1e2f4 100644
--- a/pgxn/neon/libpagestore.c
+++ b/pgxn/neon/libpagestore.c
@@ -92,11 +92,10 @@ pageserver_connect()
 
 	while (PQisBusy(pageserver_conn))
 	{
-		int			wc;
 		WaitEvent	event;
 
 		/* Sleep until there's something to do */
-		wc = WaitEventSetWait(pageserver_conn_wes, -1L, &event, 1, PG_WAIT_EXTENSION);
+		(void) WaitEventSetWait(pageserver_conn_wes, -1L, &event, 1, PG_WAIT_EXTENSION);
 		ResetLatch(MyLatch);
 
 		CHECK_FOR_INTERRUPTS();
@@ -136,11 +135,10 @@ retry:
 
 	if (ret == 0)
 	{
-		int			wc;
 		WaitEvent	event;
 
 		/* Sleep until there's something to do */
-		wc = WaitEventSetWait(pageserver_conn_wes, -1L, &event, 1, PG_WAIT_EXTENSION);
+		(void) WaitEventSetWait(pageserver_conn_wes, -1L, &event, 1, PG_WAIT_EXTENSION);
 		ResetLatch(MyLatch);
 
 		CHECK_FOR_INTERRUPTS();
diff --git a/pgxn/neon/pagestore_smgr.c b/pgxn/neon/pagestore_smgr.c
index d9b45e3933..21067fb56f 100644
--- a/pgxn/neon/pagestore_smgr.c
+++ b/pgxn/neon/pagestore_smgr.c
@@ -1649,7 +1649,8 @@ neon_close(SMgrRelation reln, ForkNumber forknum)
 bool
 neon_prefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
 {
-	uint64 ring_index PG_USED_FOR_ASSERTS_ONLY;
+	BufferTag	tag;
+	uint64		ring_index PG_USED_FOR_ASSERTS_ONLY;
 
 	switch (reln->smgr_relpersistence)
 	{
@@ -1665,7 +1666,7 @@ neon_prefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
 			elog(ERROR, "unknown relpersistence '%c'", reln->smgr_relpersistence);
 	}
 
-	BufferTag tag = (BufferTag) {
+	tag = (BufferTag) {
 		.rnode = reln->smgr_rnode.node,
 		.forkNum = forknum,
 		.blockNum = blocknum
diff --git a/pgxn/neon/walproposer.c b/pgxn/neon/walproposer.c
index c24142dca1..8323811b0d 100644
--- a/pgxn/neon/walproposer.c
+++ b/pgxn/neon/walproposer.c
@@ -119,6 +119,7 @@ static TimestampTz last_reconnect_attempt;
 static WalproposerShmemState * walprop_shared;
 
 /* Prototypes for private functions */
+static void WalProposerRegister(void);
 static void WalProposerInit(XLogRecPtr flushRecPtr, uint64 systemId);
 static void WalProposerStart(void);
 static void WalProposerLoop(void);
@@ -455,7 +456,7 @@ WalProposerPoll(void)
 /*
  * Register a background worker proposing WAL to wal acceptors.
  */
-void
+static void
 WalProposerRegister(void)
 {
 	BackgroundWorker bgw;
diff --git a/pgxn/neon/walproposer.h b/pgxn/neon/walproposer.h
index 3c4f080353..362b194b32 100644
--- a/pgxn/neon/walproposer.h
+++ b/pgxn/neon/walproposer.h
@@ -377,18 +377,18 @@ typedef struct Safekeeper
 	AppendResponse appendResponse;	/* feedback for master */
 } Safekeeper;
 
-extern PGDLLIMPORT void WalProposerMain(Datum main_arg);
-void		WalProposerBroadcast(XLogRecPtr startpos, XLogRecPtr endpos);
-void		WalProposerPoll(void);
-void		WalProposerRegister(void);
-void		ParseReplicationFeedbackMessage(StringInfo reply_message,
-											ReplicationFeedback * rf);
+extern void WalProposerSync(int argc, char *argv[]);
+extern void WalProposerMain(Datum main_arg);
+extern void WalProposerBroadcast(XLogRecPtr startpos, XLogRecPtr endpos);
+extern void WalProposerPoll(void);
+extern void ParseReplicationFeedbackMessage(StringInfo reply_message,
+											ReplicationFeedback *rf);
 extern void StartProposerReplication(StartReplicationCmd *cmd);
 
-Size		WalproposerShmemSize(void);
-bool		WalproposerShmemInit(void);
-void		replication_feedback_set(ReplicationFeedback * rf);
-void		replication_feedback_get_lsns(XLogRecPtr *writeLsn, XLogRecPtr *flushLsn, XLogRecPtr *applyLsn);
+extern Size WalproposerShmemSize(void);
+extern bool WalproposerShmemInit(void);
+extern void replication_feedback_set(ReplicationFeedback *rf);
+extern void replication_feedback_get_lsns(XLogRecPtr *writeLsn, XLogRecPtr *flushLsn, XLogRecPtr *applyLsn);
 
 /* libpqwalproposer hooks & helper type */