diff --git a/PKHUD/ContainerView.swift b/PKHUD/ContainerView.swift
index 72c539d..a83d8bf 100644
--- a/PKHUD/ContainerView.swift
+++ b/PKHUD/ContainerView.swift
@@ -10,7 +10,7 @@
 import UIKit
 
 /// The window used to display the PKHUD within. Placed atop the applications main window.
-internal class ContainerView: UIView {
+internal final class ContainerView: UIView {
 
     private var keyboardIsVisible = false
     private var keyboardHeight: CGFloat = 0.0
diff --git a/PKHUD/FrameView.swift b/PKHUD/FrameView.swift
index 53ea0f7..7782957 100644
--- a/PKHUD/FrameView.swift
+++ b/PKHUD/FrameView.swift
@@ -10,7 +10,7 @@
 import UIKit
 
 /// Provides the general look and feel of the PKHUD, into which the eventual content is inserted.
-internal class FrameView: UIVisualEffectView {
+internal final class FrameView: UIVisualEffectView {
 
     internal init() {
         super.init(effect: UIBlurEffect(style: .light))