diff --git a/components/script/dom/canvasrenderingcontext2d.rs b/components/script/dom/canvasrenderingcontext2d.rs
index 4defd9ad53f..32f637d60bf 100644
--- a/components/script/dom/canvasrenderingcontext2d.rs
+++ b/components/script/dom/canvasrenderingcontext2d.rs
@@ -2,8 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use std::mem;
-
 use canvas_traits::canvas::{Canvas2dMsg, CanvasId, CanvasMsg};
 use dom_struct::dom_struct;
 use euclid::default::{Point2D, Rect, Size2D};
diff --git a/components/script/dom/htmlscriptelement.rs b/components/script/dom/htmlscriptelement.rs
index 72484916e33..4211a530c9e 100644
--- a/components/script/dom/htmlscriptelement.rs
+++ b/components/script/dom/htmlscriptelement.rs
@@ -6,7 +6,6 @@ use core::ffi::c_void;
 use std::cell::Cell;
 use std::fs::{create_dir_all, read_to_string, File};
 use std::io::{Read, Seek, Write};
-use std::mem::replace;
 use std::path::PathBuf;
 use std::process::Command;
 use std::ptr;