diff --git a/discord/auditlog.go b/discord/auditlog.go
index e1de2ea..1a6bc70 100644
--- a/discord/auditlog.go
+++ b/discord/auditlog.go
@@ -116,7 +116,7 @@ type AuditEntryInfo struct {
 	//
 	// Events: CHANNEL_OVERWRITE_CREATE, CHANNEL_OVERWRITE_UPDATE,
 	// CHANNEL_OVERWRITE_DELETE
-	Type ChannelOverwritten `json:"type,omitempty"`
+	Type OverwriteType `json:"type,omitempty"`
 	// RoleName is the name of the role if type is "role".
 	//
 	// Events: CHANNEL_OVERWRITE_CREATE, CHANNEL_OVERWRITE_UPDATE,
@@ -124,15 +124,6 @@ type AuditEntryInfo struct {
 	RoleName string `json:"role_name,omitempty"`
 }
 
-// ChannelOverwritten is the type of overwritten entity in
-// (AuditEntryInfo).Type.
-type ChannelOverwritten string
-
-const (
-	MemberChannelOverwritten ChannelOverwritten = "member"
-	RoleChannelOverwritten   ChannelOverwritten = "role"
-)
-
 // AuditLogChange is a single key type to changed value audit log entry. The
 // type can be found in the key's comment. Values can be nil.
 //
diff --git a/discord/channel.go b/discord/channel.go
index 5668ae6..b9df502 100644
--- a/discord/channel.go
+++ b/discord/channel.go
@@ -104,7 +104,7 @@ var (
 type Overwrite struct {
 	// ID is the role or user id.
 	ID Snowflake `json:"id"`
-	// Type is either "role" or "member".
+	// Type indicates the entity overwritten: role or member.
 	Type OverwriteType `json:"type,string"`
 	// Allow is a permission bit set for granted permissions.
 	Allow Permissions `json:"allow,string"`
@@ -112,6 +112,8 @@ type Overwrite struct {
 	Deny Permissions `json:"deny,string"`
 }
 
+// OverwriteType is an enumerated type to indicate the entity being overwritten:
+// role or member
 type OverwriteType uint8
 
 const (
diff --git a/discord/permission.go b/discord/permission.go
index 6444a66..5e7be27 100644
--- a/discord/permission.go
+++ b/discord/permission.go
@@ -157,7 +157,7 @@ func CalcOverwrites(guild Guild, channel Channel, member Member) Permissions {
 
 	for _, overwrite := range channel.Permissions {
 		for _, id := range member.RoleIDs {
-			if id == RoleID(overwrite.ID) && overwrite.Type == "role" {
+			if id == RoleID(overwrite.ID) && overwrite.Type == OverwriteRole {
 				deny |= overwrite.Deny
 				allow |= overwrite.Allow
 				break