diff --git a/Source/OpenTK/OpenAL/AlutFunctions.cs b/Source/OpenTK/OpenAL/AlutFunctions.cs
index 8df34f1e..51a5c39a 100644
--- a/Source/OpenTK/OpenAL/AlutFunctions.cs
+++ b/Source/OpenTK/OpenAL/AlutFunctions.cs
@@ -162,7 +162,7 @@ namespace OpenTK.OpenAL
/// Number of seconds. May not be negative.
/// Success.
[DllImport( Alut.Lib, EntryPoint = "alutSleep", ExactSpelling = true, CallingConvention = Alut.Style ), SuppressUnmanagedCodeSecurity( )]
- public static extern AL.Bool Sleep( float duration );
+ public static extern bool Sleep( float duration );
// ALUT_API ALboolean ALUT_APIENTRY alutSleep (ALfloat duration);
*/
#endregion Misc