diff --git a/pgxn/neon/file_cache.c b/pgxn/neon/file_cache.c
index 562665bf9b..d42c18926b 100644
--- a/pgxn/neon/file_cache.c
+++ b/pgxn/neon/file_cache.c
@@ -792,8 +792,7 @@ lfc_prewarm(FileCacheStateEntry* fs, size_t n_entries)
 				LWLockRelease(lfc_lock);
 			}
 
-			n_received += 1;
-			if (rcv_idx >= n_entries * BLOCKS_PER_CHUNK)
+			if (++n_received == n_sent && snd_idx >= n_entries * BLOCKS_PER_CHUNK)
 			{
 				break;
 			}