diff --git a/pgxn/neon/file_cache.c b/pgxn/neon/file_cache.c
index d124ce59ba..f3f8450937 100644
--- a/pgxn/neon/file_cache.c
+++ b/pgxn/neon/file_cache.c
@@ -156,6 +156,7 @@ static void lfc_init_prewarm(void);
 
 #define LFC_ENABLED() (lfc_ctl->limit != 0)
 
+PGDLLEXPORT void LfcPrewarmMain(Datum main_arg);
 
 static void
 LfcCheckpointHook(int flags)
diff --git a/pgxn/neon/file_cache.h b/pgxn/neon/file_cache.h
deleted file mode 100644
index 65985eb54d..0000000000
--- a/pgxn/neon/file_cache.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * file_cache.h
- *
- *
- * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *-------------------------------------------------------------------------
- */
-#ifndef file_cache_h
-#define file_cache_h
-
-#include "neon_pgversioncompat.h"
-
-/* Local file storage allocation chunk.
- * Should be power of two. Using larger than page chunks can
- * 1. Reduce hash-map memory footprint: 8TB database contains billion pages
- *    and size of hash entry is 40 bytes, so we need 40Gb just for hash map.
- *    1Mb chunks can reduce hash map size to 320Mb.
- * 2. Improve access locality, subsequent pages will be allocated together improving seqscan speed
- */
-#define BLOCKS_PER_CHUNK	128 /* 1Mb chunk */
-#define CHUNK_BITMAP_SIZE   ((BLOCKS_PER_CHUNK + 31) / 32)
-
-typedef struct
-{
-	BufferTag	key;
-	uint32		bitmap[CHUNK_BITMAP_SIZE];
-} FileCacheEntryDesc;
-
-PGDLLEXPORT void LfcPrewarmMain(Datum main_arg);
-
-extern void lfc_writev(NRelFileInfo rinfo, ForkNumber forkNum,
-					   BlockNumber blkno, const void *const *buffers,
-					   BlockNumber nblocks);
-/* returns number of blocks read, with one bit set in *read for each  */
-extern int lfc_readv_select(NRelFileInfo rinfo, ForkNumber forkNum,
-							BlockNumber blkno, void **buffers,
-							BlockNumber nblocks, bits8 *mask);
-
-extern bool lfc_cache_contains(NRelFileInfo rinfo, ForkNumber forkNum,
-							   BlockNumber blkno);
-extern int lfc_cache_containsv(NRelFileInfo rinfo, ForkNumber forkNum,
-							   BlockNumber blkno, int nblocks, bits8 *bitmap);
-extern void lfc_evict(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno);
-extern void lfc_init(void);
-
-static inline bool
-lfc_read(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
-		 void *buffer)
-{
-	bits8		rv = 0;
-	return lfc_readv_select(rinfo, forkNum, blkno, &buffer, 1, &rv) == 1;
-}
-
-static inline void
-lfc_write(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
-		  const void *buffer)
-{
-	return lfc_writev(rinfo, forkNum, blkno, &buffer, 1);
-}
-
-#endif