diff --git a/set.go b/set.go
index 879527a..2762ad9 100644
--- a/set.go
+++ b/set.go
@@ -1,33 +1,32 @@
 package dnsexit_manager
 
-
 type Set struct {
-  elements map[interface{}]struct{}
+	elements map[interface{}]struct{}
 }
 
 func CreateSet() *Set {
-  return &Set{
-    elements: make(map[interface{}]struct{}),
-  }
+	return &Set{
+		elements: make(map[interface{}]struct{}),
+	}
 }
 
 func (set *Set) Add(value interface{}) {
-  _, found := set.elements[value]
-  
-  if !found{
-    set.elements[value] = struct{}{}
-  }
+	_, found := set.elements[value]
+
+	if !found {
+		set.elements[value] = struct{}{}
+	}
 }
 
 func (set *Set) Delete(value interface{}) {
-  delete(set.elements, value)
+	delete(set.elements, value)
 }
 
 func (set *Set) List() []interface{} {
-  keys := make([]interface{}, 0, len(set.elements))
-  for key := range set.elements {
-    keys = append(keys, key)
-  }
+	keys := make([]interface{}, 0, len(set.elements))
+	for _, key := range set.elements {
+		keys = append(keys, key)
+	}
 
-  return keys
+	return keys
 }