diff --git a/glutin/src/api/wgl/surface.rs b/glutin/src/api/wgl/surface.rs
index 7034bbf851..6ec93ce672 100644
--- a/glutin/src/api/wgl/surface.rs
+++ b/glutin/src/api/wgl/surface.rs
@@ -295,7 +295,7 @@ impl<T: SurfaceTypeTrait> Sealed for Surface<T> {}
 
 /// A wrapper around WGL surfaces.
 #[derive(Debug)]
-pub enum WglSurface {
+pub(crate) enum WglSurface {
     /// Surface backed by a window surface.
     Window(HWND, HDC),
     /// Surface backed by a pixel buffer.