diff --git a/Source/OpenTK/Input/MouseEventArgs.cs b/Source/OpenTK/Input/MouseEventArgs.cs
index a5829e9b..a8a9137c 100644
--- a/Source/OpenTK/Input/MouseEventArgs.cs
+++ b/Source/OpenTK/Input/MouseEventArgs.cs
@@ -252,6 +252,7 @@ namespace OpenTK.Input
             : base(x, y)
         {
             this.button = button;
+            this.IsPressed = pressed;
         }
 
         /// <summary>