diff --git a/pgxn/neon/libpagestore.c b/pgxn/neon/libpagestore.c
index 16406ce8a3..5056a3c5ff 100644
--- a/pgxn/neon/libpagestore.c
+++ b/pgxn/neon/libpagestore.c
@@ -17,7 +17,6 @@
 #include "pagestore_client.h"
 #include "fmgr.h"
 #include "access/xlog.h"
-#include "access/xlogutils.h"
 #include "storage/buf_internals.h"
 #include "storage/lwlock.h"
 #include "storage/ipc.h"
@@ -62,8 +61,8 @@ char	   *neon_auth_token;
 int			readahead_buffer_size = 128;
 int			flush_every_n_requests = 8;
 
-int			n_reconnect_attempts = 0;
-int			max_reconnect_attempts = 60;
+static int n_reconnect_attempts = 0;
+static int max_reconnect_attempts = 60;
 
 #define MAX_PAGESERVER_CONNSTRING_SIZE 256
 
@@ -83,8 +82,6 @@ static PagestoreShmemState *pagestore_shared;
 static uint64 pagestore_local_counter = 0;
 static char local_pageserver_connstring[MAX_PAGESERVER_CONNSTRING_SIZE];
 
-bool		(*old_redo_read_buffer_filter) (XLogReaderState *record, uint8 block_id) = NULL;
-
 static bool pageserver_flush(void);
 static void pageserver_disconnect(void);
 
@@ -627,8 +624,6 @@ pg_init_libpagestore(void)
 		smgr_hook = smgr_neon;
 		smgr_init_hook = smgr_init_neon;
 		dbsize_hook = neon_dbsize;
-		old_redo_read_buffer_filter = redo_read_buffer_filter;
-		redo_read_buffer_filter = neon_redo_read_buffer_filter;
 	}
 
 	lfc_init();
diff --git a/pgxn/neon/neon.h b/pgxn/neon/neon.h
index 897a8373a1..c3afecc679 100644
--- a/pgxn/neon/neon.h
+++ b/pgxn/neon/neon.h
@@ -27,13 +27,6 @@ extern void pg_init_walproposer(void);
 
 extern void pg_init_extension_server(void);
 
-/*
- * Returns true if we shouldn't do REDO on that block in record indicated by
- * block_id; false otherwise.
- */
-extern bool neon_redo_read_buffer_filter(XLogReaderState *record, uint8 block_id);
-extern bool (*old_redo_read_buffer_filter) (XLogReaderState *record, uint8 block_id);
-
 extern uint64 BackpressureThrottlingTime(void);
 extern void replication_feedback_get_lsns(XLogRecPtr *writeLsn, XLogRecPtr *flushLsn, XLogRecPtr *applyLsn);
 
diff --git a/pgxn/neon/pagestore_smgr.c b/pgxn/neon/pagestore_smgr.c
index 609d80588c..99e6583ab2 100644
--- a/pgxn/neon/pagestore_smgr.c
+++ b/pgxn/neon/pagestore_smgr.c
@@ -47,9 +47,10 @@
 
 #include "access/xact.h"
 #include "access/xlog.h"
+#include "access/xlogdefs.h"
 #include "access/xloginsert.h"
 #include "access/xlog_internal.h"
-#include "access/xlogdefs.h"
+#include "access/xlogutils.h"
 #include "catalog/pg_class.h"
 #include "common/hashfn.h"
 #include "executor/instrument.h"
@@ -106,6 +107,9 @@ typedef enum
 static SMgrRelation unlogged_build_rel = NULL;
 static UnloggedBuildPhase unlogged_build_phase = UNLOGGED_BUILD_NOT_IN_PROGRESS;
 
+static bool neon_redo_read_buffer_filter(XLogReaderState *record, uint8 block_id);
+static bool (*old_redo_read_buffer_filter) (XLogReaderState *record, uint8 block_id) = NULL;
+
 /*
  * Prefetch implementation:
  *
@@ -239,7 +243,7 @@ typedef struct PrefetchState
 	PrefetchRequest prf_buffer[];	/* prefetch buffers */
 } PrefetchState;
 
-PrefetchState *MyPState;
+static PrefetchState *MyPState;
 
 #define GetPrfSlot(ring_index) ( \
 	( \
@@ -257,7 +261,7 @@ PrefetchState *MyPState;
 	) \
 )
 
-XLogRecPtr	prefetch_lsn = 0;
+static XLogRecPtr prefetch_lsn = 0;
 
 static bool compact_prefetch_buffers(void);
 static void consume_prefetch_responses(void);
@@ -1371,6 +1375,9 @@ neon_init(void)
 	MyPState->prf_hash = prfh_create(MyPState->hashctx,
 									 readahead_buffer_size, NULL);
 
+	old_redo_read_buffer_filter = redo_read_buffer_filter;
+	redo_read_buffer_filter = neon_redo_read_buffer_filter;
+
 #ifdef DEBUG_COMPARE_LOCAL
 	mdinit();
 #endif
@@ -2869,7 +2876,7 @@ get_fsm_physical_block(BlockNumber heapblk)
  * contents, where with REDO locking it would wait on block 1 and see
  * block 3 with post-REDO contents only.
  */
-bool
+static bool
 neon_redo_read_buffer_filter(XLogReaderState *record, uint8 block_id)
 {
 	XLogRecPtr	end_recptr = record->EndRecPtr;