diff --git a/combobox.go b/combobox.go
index 54403b1..d42b353 100644
--- a/combobox.go
+++ b/combobox.go
@@ -42,7 +42,7 @@ func (c *Combobox) Append(what ...string) {
 	defer c.lock.Unlock()
 
 	if c.created {
-		for i, s := range what {
+		for _, s := range what {
 			c.sysData.append(s)
 		}
 		return
@@ -141,10 +141,7 @@ func (c *Combobox) make(window *sysData) (err error) {
 		return err
 	}
 	for _, s := range c.initItems {
-		err = c.sysData.append(s)
-		if err != nil {
-			return err
-		}
+		c.sysData.append(s)
 	}
 	c.created = true
 	return nil
diff --git a/listbox.go b/listbox.go
index b028bdc..8bd54b1 100644
--- a/listbox.go
+++ b/listbox.go
@@ -34,7 +34,7 @@ func (l *Listbox) Append(what ...string) {
 	defer l.lock.Unlock()
 
 	if l.created {
-		for i, s := range what {
+		for _, s := range what {
 			l.sysData.append(s)
 		}
 		return
@@ -126,10 +126,7 @@ func (l *Listbox) make(window *sysData) (err error) {
 		return err
 	}
 	for _, s := range l.initItems {
-		err = l.sysData.append(s)
-		if err != nil {
-			return err
-		}
+		l.sysData.append(s)
 	}
 	l.created = true
 	return nil