diff --git a/src/backends/cg.rs b/src/backends/cg.rs
index ba957d85..8b30dc95 100644
--- a/src/backends/cg.rs
+++ b/src/backends/cg.rs
@@ -144,7 +144,10 @@ impl<D, W> Drop for CGImpl<D, W> {
 
 impl<D: HasDisplayHandle, W: HasWindowHandle> SurfaceInterface<D, W> for CGImpl<D, W> {
     type Context = D;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     fn new(window_src: W, _display: &D) -> Result<Self, InitError<W>> {
         // `NSView`/`UIView` can only be accessed from the main thread.
diff --git a/src/backends/kms.rs b/src/backends/kms.rs
index 901fc738..8dca03e5 100644
--- a/src/backends/kms.rs
+++ b/src/backends/kms.rs
@@ -134,7 +134,10 @@ struct SharedBuffer {
 
 impl<D: HasDisplayHandle + ?Sized, W: HasWindowHandle> SurfaceInterface<D, W> for KmsImpl<D, W> {
     type Context = Arc<KmsDisplayImpl<D>>;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     /// Create a new KMS backend.
     fn new(window: W, display: &Arc<KmsDisplayImpl<D>>) -> Result<Self, InitError<W>> {
diff --git a/src/backends/orbital.rs b/src/backends/orbital.rs
index 96c3db1d..c6ff3004 100644
--- a/src/backends/orbital.rs
+++ b/src/backends/orbital.rs
@@ -128,7 +128,10 @@ impl<D: HasDisplayHandle, W: HasWindowHandle> OrbitalImpl<D, W> {
 
 impl<D: HasDisplayHandle, W: HasWindowHandle> SurfaceInterface<D, W> for OrbitalImpl<D, W> {
     type Context = D;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     fn new(window: W, _display: &D) -> Result<Self, InitError<W>> {
         let raw = window.window_handle()?.as_raw();
diff --git a/src/backends/wayland/mod.rs b/src/backends/wayland/mod.rs
index 2dda8d2b..a5b00aa9 100644
--- a/src/backends/wayland/mod.rs
+++ b/src/backends/wayland/mod.rs
@@ -151,7 +151,10 @@ impl<D: HasDisplayHandle + ?Sized, W: HasWindowHandle> SurfaceInterface<D, W>
     for WaylandImpl<D, W>
 {
     type Context = Arc<WaylandDisplayImpl<D>>;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     fn new(window: W, display: &Arc<WaylandDisplayImpl<D>>) -> Result<Self, InitError<W>> {
         // Get the raw Wayland window.
diff --git a/src/backends/web.rs b/src/backends/web.rs
index 539e2d2a..b9579da1 100644
--- a/src/backends/web.rs
+++ b/src/backends/web.rs
@@ -207,7 +207,10 @@ impl<D: HasDisplayHandle, W: HasWindowHandle> WebImpl<D, W> {
 
 impl<D: HasDisplayHandle, W: HasWindowHandle> SurfaceInterface<D, W> for WebImpl<D, W> {
     type Context = WebDisplayImpl<D>;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     fn new(window: W, display: &WebDisplayImpl<D>) -> Result<Self, InitError<W>> {
         let raw = window.window_handle()?.as_raw();
diff --git a/src/backends/win32.rs b/src/backends/win32.rs
index 084ad47b..840a99c4 100644
--- a/src/backends/win32.rs
+++ b/src/backends/win32.rs
@@ -208,7 +208,10 @@ impl<D: HasDisplayHandle, W: HasWindowHandle> Win32Impl<D, W> {
 
 impl<D: HasDisplayHandle, W: HasWindowHandle> SurfaceInterface<D, W> for Win32Impl<D, W> {
     type Context = D;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     /// Create a new `Win32Impl` from a `Win32WindowHandle`.
     fn new(window: W, _display: &D) -> Result<Self, crate::error::InitError<W>> {
diff --git a/src/backends/x11.rs b/src/backends/x11.rs
index b01fb5f3..44aa770e 100644
--- a/src/backends/x11.rs
+++ b/src/backends/x11.rs
@@ -184,7 +184,10 @@ struct ShmBuffer {
 
 impl<D: HasDisplayHandle + ?Sized, W: HasWindowHandle> SurfaceInterface<D, W> for X11Impl<D, W> {
     type Context = Arc<X11DisplayImpl<D>>;
-    type Buffer<'a> = BufferImpl<'a, D, W> where Self: 'a;
+    type Buffer<'a>
+        = BufferImpl<'a, D, W>
+    where
+        Self: 'a;
 
     /// Create a new `X11Impl` from a `HasWindowHandle`.
     fn new(window_src: W, display: &Arc<X11DisplayImpl<D>>) -> Result<Self, InitError<W>> {