diff --git a/.swiftlint.yml b/.swiftlint.yml
index ed30a86..90c9a34 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -10,7 +10,7 @@ whitelist_rules:
   - array_init
 #  - attributes # Contradicts with SwiftFormat option 'funcattributes = prev-line'.
   - block_based_kvo
-#  - class_delegate_protocol
+  - class_delegate_protocol
   - closing_brace
   - closure_body_length
   - closure_end_indentation
diff --git a/pass/Controllers/PasswordEditorTableViewController.swift b/pass/Controllers/PasswordEditorTableViewController.swift
index 284a77a..5803713 100644
--- a/pass/Controllers/PasswordEditorTableViewController.swift
+++ b/pass/Controllers/PasswordEditorTableViewController.swift
@@ -29,7 +29,7 @@ enum PasswordEditorCellKey {
     case type, title, content, placeholders
 }
 
-protocol PasswordSettingSliderTableViewCellDelegate {
+protocol PasswordSettingSliderTableViewCellDelegate: AnyObject {
     func generateAndCopyPassword()
 }
 
diff --git a/pass/Controllers/QRScannerController.swift b/pass/Controllers/QRScannerController.swift
index 0ee9453..5ce782d 100644
--- a/pass/Controllers/QRScannerController.swift
+++ b/pass/Controllers/QRScannerController.swift
@@ -12,7 +12,7 @@ import passKit
 import SVProgressHUD
 import UIKit
 
-protocol QRScannerControllerDelegate {
+protocol QRScannerControllerDelegate: AnyObject {
     func checkScannedOutput(line: String) -> (accept: Bool, message: String)
     func handleScannedOutput(line: String)
 }
diff --git a/pass/Views/FillPasswordTableViewCell.swift b/pass/Views/FillPasswordTableViewCell.swift
index cff46a6..bfa07c0 100644
--- a/pass/Views/FillPasswordTableViewCell.swift
+++ b/pass/Views/FillPasswordTableViewCell.swift
@@ -9,7 +9,7 @@
 import passKit
 import UIKit
 
-protocol FillPasswordTableViewCellDelegate {
+protocol FillPasswordTableViewCellDelegate: AnyObject {
     func generateAndCopyPassword()
     func showHidePasswordSettings()
 }