diff --git a/ANX.Framework/Input/ButtonState.cs b/ANX.Framework/Input/ButtonState.cs
index d8128e5e..8c55755f 100644
--- a/ANX.Framework/Input/ButtonState.cs
+++ b/ANX.Framework/Input/ButtonState.cs
@@ -52,7 +52,7 @@ using System;
 
 namespace ANX.Framework.Input
 {
-    public enum ButtonState
+    public enum ButtonState : byte
     {
         Released,
         Pressed
diff --git a/ANX.Framework/Input/GamePadDeadZone.cs b/ANX.Framework/Input/GamePadDeadZone.cs
index bcbb70d8..7aef5c8d 100644
--- a/ANX.Framework/Input/GamePadDeadZone.cs
+++ b/ANX.Framework/Input/GamePadDeadZone.cs
@@ -52,7 +52,7 @@ using System;
 
 namespace ANX.Framework.Input
 {
-    public enum GamePadDeadZone
+    public enum GamePadDeadZone : byte
     {
         None,
         IndependentAxes,
diff --git a/ANX.Framework/Input/GamePadType.cs b/ANX.Framework/Input/GamePadType.cs
index f5d4168b..ffb46a8c 100644
--- a/ANX.Framework/Input/GamePadType.cs
+++ b/ANX.Framework/Input/GamePadType.cs
@@ -52,7 +52,7 @@ using System;
 
 namespace ANX.Framework.Input
 {
-    public enum GamePadType
+    public enum GamePadType :short
     {
         Unknown,
         GamePad,
diff --git a/ANX.Framework/Input/Keys.cs b/ANX.Framework/Input/Keys.cs
index 4155bb9f..13b8782d 100644
--- a/ANX.Framework/Input/Keys.cs
+++ b/ANX.Framework/Input/Keys.cs
@@ -52,7 +52,7 @@ using System;
 
 namespace ANX.Framework.Input
 {
-    public enum Keys
+    public enum Keys : byte
     {
         None = 0,
         Back = 8,