diff --git a/Source/OpenTK/Platform/X11/X11DisplayDevice.cs b/Source/OpenTK/Platform/X11/X11DisplayDevice.cs
index 5c2d90b0..76788beb 100644
--- a/Source/OpenTK/Platform/X11/X11DisplayDevice.cs
+++ b/Source/OpenTK/Platform/X11/X11DisplayDevice.cs
@@ -39,7 +39,7 @@ namespace OpenTK.Platform.X11
             using (new XLock(API.DefaultDisplay))
             {
                 List<DisplayDevice> devices = new List<DisplayDevice>();
-                bool xinerama_supported = false;
+                xinerama_supported = false;
                 try
                 {
                     xinerama_supported = QueryXinerama(devices);