diff --git a/src/structures/GuildChannel.js b/src/structures/GuildChannel.js
index ffae8c36b..98dfd4d92 100644
--- a/src/structures/GuildChannel.js
+++ b/src/structures/GuildChannel.js
@@ -94,7 +94,7 @@ class GuildChannel extends Channel {
   /**
    * Gets the overall set of permissions for a member or role in this channel, taking into account channel overwrites.
    * @param {GuildMemberResolvable|RoleResolvable} memberOrRole The member or role to obtain the overall permissions for
-   * @returns {?Permissions}
+   * @returns {?Readonly<Permissions>}
    */
   permissionsFor(memberOrRole) {
     const member = this.guild.members.resolve(memberOrRole);
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 32dac849d..c36e6a1f7 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -523,7 +523,7 @@ declare module 'discord.js' {
 			options: Array<Partial<PermissionOverwrites|PermissionOverwriteOptions>> | Collection<Snowflake, Partial<PermissionOverwriteOptions>>,
 			reason?: string
 		): Promise<GuildChannel>;
-		public permissionsFor(memberOrRole: GuildMemberResolvable | RoleResolvable): Permissions;
+		public permissionsFor(memberOrRole: GuildMemberResolvable | RoleResolvable): Readonly<Permissions>;
 		public setName(name: string, reason?: string): Promise<GuildChannel>;
 		public setParent(channel: GuildChannel | Snowflake, options?: { lockPermissions?: boolean, reason?: string }): Promise<GuildChannel>;
 		public setPosition(position: number, options?: { relative?: boolean, reason?: string }): Promise<GuildChannel>;