diff --git a/Source/OpenTK/Graphics/DisplayResolution.cs b/Source/OpenTK/Graphics/DisplayResolution.cs
index ebe05fd5..67932f88 100644
--- a/Source/OpenTK/Graphics/DisplayResolution.cs
+++ b/Source/OpenTK/Graphics/DisplayResolution.cs
@@ -129,6 +129,11 @@ namespace OpenTK.Graphics
 
         public static bool operator== (DisplayResolution left, DisplayResolution right)
         {
+            if (((object)left) == null && ((object)right) == null)
+                return true;
+            else if ((((object)left) == null && ((object)right) != null) ||
+                     (((object)left) != null && ((object)right) == null))
+                return false;
             return left.Equals(right);
         }