diff --git a/Source/OpenTK/Input/GamePadState.cs b/Source/OpenTK/Input/GamePadState.cs
index 2ab66fe0..22f5077c 100644
--- a/Source/OpenTK/Input/GamePadState.cs
+++ b/Source/OpenTK/Input/GamePadState.cs
@@ -171,7 +171,7 @@ namespace OpenTK.Input
 
             if ((axis & GamePadAxes.LeftY) != 0)
             {
-                left_stick_y = value;
+                left_stick_y = (short)(-value);
             }
 
             if ((axis & GamePadAxes.RightX) != 0)
@@ -181,7 +181,7 @@ namespace OpenTK.Input
 
             if ((axis & GamePadAxes.RightY) != 0)
             {
-                right_stick_y = value;
+                right_stick_y = (short)(-value);
             }
 
             if ((axis & GamePadAxes.LeftTrigger) != 0)