diff --git a/Source/OpenTK/Platform/X11/Bindings/XI.cs b/Source/OpenTK/Platform/X11/Bindings/XI.cs
index 418acfea..7a4329c6 100644
--- a/Source/OpenTK/Platform/X11/Bindings/XI.cs
+++ b/Source/OpenTK/Platform/X11/Bindings/XI.cs
@@ -44,6 +44,9 @@ namespace OpenTK.Platform.X11
     {
         const string lib = "libXi";
 
+        internal const int XIAllDevices = 0;
+        internal const int XIAllMasterDevices = 1;
+
         // mouse
         internal static readonly IntPtr ButtonLeft = Functions.XInternAtom(API.DefaultDisplay, "Button Left", false);
         internal static readonly IntPtr ButtonMiddle = Functions.XInternAtom(API.DefaultDisplay, "Button Middle", false);
@@ -124,4 +127,13 @@ namespace OpenTK.Platform.X11
         [DllImport(lib, EntryPoint = "XIQueryVersion")]
         internal static extern Status QueryVersion(Display display, ref int major, ref int minor);
     }
+
+    enum XIDeviceType
+    {
+        MasterPointer = 1,
+        MasterKeyboard = 2,
+        SlavePointer = 3,
+        SlaveKeyboard = 4,
+        FloatingSlave = 5,
+    }
 }
diff --git a/Source/OpenTK/Platform/X11/Structs.cs b/Source/OpenTK/Platform/X11/Structs.cs
index 18e876ec..bc2c9adc 100644
--- a/Source/OpenTK/Platform/X11/Structs.cs
+++ b/Source/OpenTK/Platform/X11/Structs.cs
@@ -1688,7 +1688,7 @@ namespace OpenTK.Platform.X11
     {
         public int deviceid;
         public IntPtr name; // byte*
-        public int use;
+        public XIDeviceType use;
         public int attachment;
         public Bool enabled;
         public int num_classes;