diff --git a/inc/fdb_def.h b/inc/fdb_def.h
index 5e422f3..0fe43a3 100644
--- a/inc/fdb_def.h
+++ b/inc/fdb_def.h
@@ -27,7 +27,7 @@ extern "C" {
 
 /* the KV cache table size, it will improve KV search speed when using cache */
 #ifndef FDB_KV_CACHE_TABLE_SIZE
-#define FDB_KV_CACHE_TABLE_SIZE        16
+#define FDB_KV_CACHE_TABLE_SIZE        64
 #endif
 
 /* the sector cache table size, it will improve KV save speed when using cache */