diff --git a/components/bench/ycsb.go b/components/bench/ycsb.go
index 92a00aa1cf..2db1e11e5c 100644
--- a/components/bench/ycsb.go
+++ b/components/bench/ycsb.go
@@ -139,8 +139,8 @@ func registerYcsb(root *cobra.Command) {
 	cmd.PersistentFlags().Uint32Var(&config.ConnCount, "conncount", 128, "Connection Count")
 	cmd.PersistentFlags().BoolVar(&config.ReadAllFields, "readallfields", true, "Whether Read All Fields")
 
-	cmd.PersistentFlags().Float32Var(&config.ReadProportion, "readproportion", 0, "What proportion of operations are reads, default 0.95")
-	cmd.PersistentFlags().Float32Var(&config.UpdateProportion, "updateproportion", 0, "What proportion of operations are updates, default 0.05")
+	cmd.PersistentFlags().Float32Var(&config.ReadProportion, "readproportion", 0.95, "What proportion of operations are reads, default 0.95")
+	cmd.PersistentFlags().Float32Var(&config.UpdateProportion, "updateproportion", 0.05, "What proportion of operations are updates, default 0.05")
 	cmd.PersistentFlags().Float32Var(&config.ScanProportion, "scanproportion", 0, "What proportion of operations are scans, default 0")
 	cmd.PersistentFlags().Float32Var(&config.InsertProportion, "insertproportion", 0, "What proportion of operations are inserts, default 0")
 	cmd.PersistentFlags().Float32Var(&config.ReadModifyWriteProportion, "readmodifywriteproportion", 0, "What proportion of operations are read-modify-write, default 0")