diff --git a/window/src/lib.rs b/window/src/lib.rs
index 3c2c88470..f0a4d8f23 100644
--- a/window/src/lib.rs
+++ b/window/src/lib.rs
@@ -189,7 +189,11 @@ pub trait WindowOps {
     fn enable_opengl<
         F: Send
             + 'static
-            + Fn(&mut dyn Any, &dyn WindowOps, failure::Fallible<std::rc::Rc<glium::backend::Context>>),
+            + Fn(
+                &mut dyn Any,
+                &dyn WindowOps,
+                failure::Fallible<std::rc::Rc<glium::backend::Context>>,
+            ),
     >(
         &self,
         func: F,
diff --git a/window/src/os/macos/window.rs b/window/src/os/macos/window.rs
index 36267592f..02d5c553d 100644
--- a/window/src/os/macos/window.rs
+++ b/window/src/os/macos/window.rs
@@ -389,7 +389,11 @@ impl WindowOps for Window {
     fn enable_opengl<
         F: Send
             + 'static
-            + Fn(&mut dyn Any, &dyn WindowOps, failure::Fallible<std::rc::Rc<glium::backend::Context>>),
+            + Fn(
+                &mut dyn Any,
+                &dyn WindowOps,
+                failure::Fallible<std::rc::Rc<glium::backend::Context>>,
+            ),
     >(
         &self,
         func: F,
diff --git a/window/src/os/windows/window.rs b/window/src/os/windows/window.rs
index a00a7b468..026e11379 100644
--- a/window/src/os/windows/window.rs
+++ b/window/src/os/windows/window.rs
@@ -326,7 +326,11 @@ impl WindowOps for Window {
     fn enable_opengl<
         F: Send
             + 'static
-            + Fn(&mut dyn Any, &dyn WindowOps, failure::Fallible<std::rc::Rc<glium::backend::Context>>),
+            + Fn(
+                &mut dyn Any,
+                &dyn WindowOps,
+                failure::Fallible<std::rc::Rc<glium::backend::Context>>,
+            ),
     >(
         &self,
         func: F,
diff --git a/window/src/os/x11/window.rs b/window/src/os/x11/window.rs
index 5c9c49df9..3f09d2aeb 100644
--- a/window/src/os/x11/window.rs
+++ b/window/src/os/x11/window.rs
@@ -525,7 +525,11 @@ impl WindowOps for Window {
     fn enable_opengl<
         F: Send
             + 'static
-            + Fn(&mut dyn Any, &dyn WindowOps, failure::Fallible<std::rc::Rc<glium::backend::Context>>),
+            + Fn(
+                &mut dyn Any,
+                &dyn WindowOps,
+                failure::Fallible<std::rc::Rc<glium::backend::Context>>,
+            ),
     >(
         &self,
         func: F,