diff --git a/Source/OpenTK/GameWindowFlags.cs b/Source/OpenTK/GameWindowFlags.cs
index 91bfca18..dfb6fbda 100644
--- a/Source/OpenTK/GameWindowFlags.cs
+++ b/Source/OpenTK/GameWindowFlags.cs
@@ -44,5 +44,10 @@ namespace OpenTK
         /// Indicates that the GameWindow should cover the whole screen.
         /// </summary>
         Fullscreen = 1,
+
+        /// <summary>
+        /// Indicates that the GameWindow should be a fixed window.
+        /// </summary>
+        FixedWindow = 2,
     }
 }
\ No newline at end of file
diff --git a/Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs b/Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs
index 036fb5c7..3700aef3 100644
--- a/Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs
+++ b/Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs
@@ -77,7 +77,6 @@ namespace OpenTK.Platform.SDL2
                 var bounds = device.Bounds;
                 var flags = TranslateFlags(options);
                 flags |= WindowFlags.OPENGL;
-                flags |= WindowFlags.RESIZABLE;
                 flags |= WindowFlags.HIDDEN;
                 if (Toolkit.Options.EnableHighResolution)
                 {
@@ -88,6 +87,9 @@ namespace OpenTK.Platform.SDL2
                     (flags & WindowFlags.FULLSCREEN) != 0)
                     window_state = WindowState.Fullscreen;
 
+                if ((flags & WindowFlags.RESIZABLE) == 0)
+                    window_border = WindowBorder.Fixed;
+
                 IntPtr handle;
                 lock (SDL.Sync)
                 {
@@ -114,8 +116,11 @@ namespace OpenTK.Platform.SDL2
                     else
                         return WindowFlags.FULLSCREEN;
 
-                default:
+                case GameWindowFlags.FixedWindow:
                     return WindowFlags.Default;
+
+                default:
+                    return WindowFlags.Default | WindowFlags.RESIZABLE;
             }
         }