diff --git a/inc/fdb_def.h b/inc/fdb_def.h
index 0fe43a3..29c3eb1 100644
--- a/inc/fdb_def.h
+++ b/inc/fdb_def.h
@@ -22,7 +22,7 @@ extern "C" {
 
 /* the KV max name length must less then it */
 #ifndef FDB_KV_NAME_MAX
-#define FDB_KV_NAME_MAX                32
+#define FDB_KV_NAME_MAX                64
 #endif
 
 /* the KV cache table size, it will improve KV search speed when using cache */