diff --git a/components/cli/opts/opts.go b/components/cli/opts/opts.go
index 8c82960c20..f76f308051 100644
--- a/components/cli/opts/opts.go
+++ b/components/cli/opts/opts.go
@@ -38,7 +38,10 @@ func NewListOptsRef(values *[]string, validator ValidatorFctType) *ListOpts {
 }
 
 func (opts *ListOpts) String() string {
-	return fmt.Sprintf("%v", []string((*opts.values)))
+	if len(*opts.values) == 0 {
+		return ""
+	}
+	return fmt.Sprintf("%v", *opts.values)
 }
 
 // Set validates if needed the input value and adds it to the
@@ -343,6 +346,9 @@ type NanoCPUs int64
 
 // String returns the string format of the number
 func (c *NanoCPUs) String() string {
+	if *c == 0 {
+		return ""
+	}
 	return big.NewRat(c.Value(), 1e9).FloatString(3)
 }
 
diff --git a/components/cli/opts/opts_test.go b/components/cli/opts/opts_test.go
index e137127156..c1e7735b58 100644
--- a/components/cli/opts/opts_test.go
+++ b/components/cli/opts/opts_test.go
@@ -93,12 +93,12 @@ func TestListOptsWithValidator(t *testing.T) {
 	// Re-using logOptsvalidator (used by MapOpts)
 	o := NewListOpts(logOptsValidator)
 	o.Set("foo")
-	if o.String() != "[]" {
-		t.Errorf("%s != []", o.String())
+	if o.String() != "" {
+		t.Errorf(`%s != ""`, o.String())
 	}
 	o.Set("foo=bar")
-	if o.String() != "[]" {
-		t.Errorf("%s != []", o.String())
+	if o.String() != "" {
+		t.Errorf(`%s != ""`, o.String())
 	}
 	o.Set("max-file=2")
 	if o.Len() != 1 {
@@ -111,8 +111,8 @@ func TestListOptsWithValidator(t *testing.T) {
 		t.Error("o.Get(\"baz\") == true")
 	}
 	o.Delete("max-file=2")
-	if o.String() != "[]" {
-		t.Errorf("%s != []", o.String())
+	if o.String() != "" {
+		t.Errorf(`%s != ""`, o.String())
 	}
 }