diff --git a/src/extensions/surface.rs b/src/extensions/surface.rs
index b3b939a..0573d79 100644
--- a/src/extensions/surface.rs
+++ b/src/extensions/surface.rs
@@ -8,8 +8,8 @@ use std::ffi::CStr;
 use ::RawPtr;
 
 pub struct Surface {
-    pub handle: vk::Instance,
-    pub surface_fn: vk::SurfaceFn,
+    handle: vk::Instance,
+    surface_fn: vk::SurfaceFn,
 }
 
 impl Surface {
diff --git a/src/extensions/win32_surface.rs b/src/extensions/win32_surface.rs
index f7b4bf3..d24d110 100644
--- a/src/extensions/win32_surface.rs
+++ b/src/extensions/win32_surface.rs
@@ -7,8 +7,8 @@ use std::ffi::CStr;
 use ::RawPtr;
 
 pub struct Win32Surface {
-    pub handle: vk::Instance,
-    pub win32_surface_fn: vk::Win32SurfaceFn,
+    handle: vk::Instance,
+    win32_surface_fn: vk::Win32SurfaceFn,
 }
 
 impl Win32Surface {
diff --git a/src/extensions/xlibsurface.rs b/src/extensions/xlibsurface.rs
index de128c1..7661432 100644
--- a/src/extensions/xlibsurface.rs
+++ b/src/extensions/xlibsurface.rs
@@ -7,8 +7,8 @@ use std::ffi::CStr;
 use ::RawPtr;
 
 pub struct XlibSurface {
-    pub handle: vk::Instance,
-    pub xlib_surface_fn: vk::XlibSurfaceFn,
+    handle: vk::Instance,
+    xlib_surface_fn: vk::XlibSurfaceFn,
 }
 
 impl XlibSurface {