diff --git a/Source/OpenTK/Platform/GdiPlus.cs b/Source/OpenTK/Platform/GdiPlus.cs
index 24538796..16a1df42 100644
--- a/Source/OpenTK/Platform/GdiPlus.cs
+++ b/Source/OpenTK/Platform/GdiPlus.cs
@@ -26,10 +26,10 @@ namespace OpenTK.Platform
 
         static GdiPlus()
         {
-            if (Configuration.RunningOnWindows)
+            if (Configuration.RunningOnWindows && !Configuration.RunningOnMono)
                 internals = new Windows.WinGdiPlusInternals();
            else
-                internals = new X11.X11GdiPlusInternals();
+                internals = new X11.X11GdiPlusInternals(); // This class is Mono-specific and works on all platforms.
         }
 
         #endregion
diff --git a/Source/OpenTK/Platform/X11/X11GdiPlusInternals.cs b/Source/OpenTK/Platform/X11/X11GdiPlusInternals.cs
index b197517a..45407b8d 100644
--- a/Source/OpenTK/Platform/X11/X11GdiPlusInternals.cs
+++ b/Source/OpenTK/Platform/X11/X11GdiPlusInternals.cs
@@ -14,6 +14,8 @@ using System.Reflection;
 
 namespace OpenTK.Platform.X11
 {
+    // Note: This class is Mono-specific, not X11-specific!
+    // It works on all platforms (windows, linux, macos) as long as we are running on Mono.
     class X11GdiPlusInternals : IGdiPlusInternals
     {
         static readonly PropertyInfo native_graphics_property, native_font_property, native_string_format_property;