diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index 7c49c2602211423669bfdd0bab433d2111110883..7f8b682909fd7e9bb60b6fa5ebdaadb0639eb16a 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -1627,7 +1627,7 @@ static void doInitGlobalConfig(void) {
   cfg.valType = TAOS_CFG_VTYPE_INT32;
   cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
   cfg.minValue = 0;
-  cfg.maxValue = 2147483647;
+  cfg.maxValue = (float)((1 << 30) - 1);  // N.B. not precise, buffer reserved
   cfg.ptrLength = 0;
   cfg.unitType = TAOS_CFG_UTYPE_NONE;
   taosInitConfigOption(cfg);