diff --git a/Cargo.lock b/Cargo.lock
index f6455f34f83..32936f9c0d6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3825,7 +3825,7 @@ dependencies = [
 [[package]]
 name = "mozjs"
 version = "0.14.1"
-source = "git+https://github.com/servo/rust-mozjs#fe104a26147a42f6267286cd856361a126ab733b"
+source = "git+https://github.com/servo/rust-mozjs#ef63e568c6aaa1c0f0d1c11f49a99acff1306709"
 dependencies = [
  "cc",
  "lazy_static",
@@ -3838,7 +3838,7 @@ dependencies = [
 [[package]]
 name = "mozjs_sys"
 version = "0.68.2"
-source = "git+https://github.com/servo/mozjs?rev=82da136c53d7ca7b0b7fe1c5622627036ef31899#82da136c53d7ca7b0b7fe1c5622627036ef31899"
+source = "git+https://github.com/servo/mozjs?rev=95387f7235ae9ba950a8dbebb850f41709ff5b1d#95387f7235ae9ba950a8dbebb850f41709ff5b1d"
 dependencies = [
  "bindgen",
  "cc",
diff --git a/canvas.png b/canvas.png
new file mode 100644
index 00000000000..d83232e20e1
Binary files /dev/null and b/canvas.png differ
diff --git a/components/script/dom/imagedata.rs b/components/script/dom/imagedata.rs
index 39e3b061711..d8574a9b666 100644
--- a/components/script/dom/imagedata.rs
+++ b/components/script/dom/imagedata.rs
@@ -113,7 +113,8 @@ impl ImageData {
         let len = width * height * 4;
         let cx = global.get_cx();
         rooted!(in (*cx) let mut array = ptr::null_mut::<JSObject>());
-        Uint8ClampedArray::create(*cx, CreateWith::Length(len), array.handle_mut()).unwrap();
+        Uint8ClampedArray::create(*cx, CreateWith::Length(len as usize), array.handle_mut())
+            .unwrap();
         (*imagedata).data.set(array.get());
 
         Ok(reflect_dom_object(imagedata, global))