diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 904c9c3adb5..e14ae81a219 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -592,7 +592,15 @@ impl LintPass for RawPointerDerive {
             return
         }
         let did = match item.node {
-            ast::ItemImpl(..) => {
+            ast::ItemImpl(_, _, _, ref t_ref_opt, _, _) => {
+                // Deriving the Copy trait does not cause a warning
+                if let &Some(ref trait_ref) = t_ref_opt {
+                    let def_id = ty::trait_ref_to_def_id(cx.tcx, trait_ref);
+                    if Some(def_id) == cx.tcx.lang_items.copy_trait() {
+                        return
+                    }
+                }
+
                 match ty::node_id_to_type(cx.tcx, item.id).sty {
                     ty::ty_enum(did, _) => did,
                     ty::ty_struct(did, _) => did,
diff --git a/src/test/run-pass/issue-21296.rs b/src/test/run-pass/issue-21296.rs
new file mode 100644
index 00000000000..f91fb064ae2
--- /dev/null
+++ b/src/test/run-pass/issue-21296.rs
@@ -0,0 +1,15 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[forbid(raw_pointer_derive)]
+#[derive(Copy)]
+struct Test(*const i32);
+
+fn main() {}