diff --git a/opts/opts.go b/opts/opts.go
index c7d6c291bb..3ae0fdb6b9 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -409,7 +409,13 @@ type MemBytes int64
 
 // String returns the string format of the human readable memory bytes
 func (m *MemBytes) String() string {
-	return units.BytesSize(float64(m.Value()))
+	// NOTE: In spf13/pflag/flag.go, "0" is considered as "zero value" while "0 B" is not.
+	// We return "0" in case value is 0 here so that the default value is hidden.
+	// (Sometimes "default 0 B" is actually misleading)
+	if m.Value() != 0 {
+		return units.BytesSize(float64(m.Value()))
+	}
+	return "0"
 }
 
 // Set sets the value of the MemBytes by passing a string