diff --git a/internal/querynodev2/server.go b/internal/querynodev2/server.go
index 7caf5ef99a..aadcfdb88a 100644
--- a/internal/querynodev2/server.go
+++ b/internal/querynodev2/server.go
@@ -392,8 +392,7 @@ func (node *QueryNode) Start() error {
 
 		paramtable.SetCreateTime(time.Now())
 		paramtable.SetUpdateTime(time.Now())
-		mmapDirPath := paramtable.Get().QueryNodeCfg.MmapDirPath.GetValue()
-		mmapEnabled := len(mmapDirPath) > 0
+		mmapEnabled := paramtable.Get().QueryNodeCfg.MmapEnabled.GetAsBool()
 		node.UpdateStateCode(commonpb.StateCode_Healthy)
 
 		registry.GetInMemoryResolver().RegisterQueryNode(node.GetNodeID(), node)