diff --git a/src/rustc/Cargo.toml b/src/rustc/Cargo.toml
index 164a3c6ad0d80..e601a1f82377f 100644
--- a/src/rustc/Cargo.toml
+++ b/src/rustc/Cargo.toml
@@ -2,6 +2,7 @@
 authors = ["The Rust Project Developers"]
 name = "rustc-main"
 version = "0.0.0"
+edition = '2018'
 
 [[bin]]
 name = "rustc_binary"
diff --git a/src/rustc/rustc.rs b/src/rustc/rustc.rs
index a0ef572933c10..fef6b830040b9 100644
--- a/src/rustc/rustc.rs
+++ b/src/rustc/rustc.rs
@@ -1,4 +1,3 @@
-#![feature(rustc_private)]
 #![feature(link_args)]
 
 // Set the stack size at link time on Windows. See rustc_driver::in_rustc_thread
@@ -11,17 +10,39 @@
 // Also, don't forget to set this for rustdoc.
 extern {}
 
-extern crate rustc_driver;
+fn main() {
+    // Pull in jemalloc when enabled.
+    //
+    // Note that we're pulling in a static copy of jemalloc which means that to
+    // pull it in we need to actually reference its symbols for it to get
+    // linked. The two crates we link to here, std and rustc_driver, are both
+    // dynamic libraries. That means to pull in jemalloc we need to actually
+    // reference allocation symbols one way or another (as this file is the only
+    // object code in the rustc executable).
+    #[cfg(feature = "jemalloc-sys")]
+    {
+        use std::os::raw::{c_void, c_int};
 
-// Note that the linkage here should be all that we need, on Linux we're not
-// prefixing the symbols here so this should naturally override our default
-// allocator. On OSX it should override via the zone allocator. We shouldn't
-// enable this by default on other platforms, so other platforms aren't handled
-// here yet.
-#[cfg(feature = "jemalloc-sys")]
-extern crate jemalloc_sys;
+        #[used]
+        static _F1: unsafe extern fn(usize, usize) -> *mut c_void =
+            jemalloc_sys::calloc;
+        #[used]
+        static _F2: unsafe extern fn(*mut *mut c_void, usize, usize) -> c_int =
+            jemalloc_sys::posix_memalign;
+        #[used]
+        static _F3: unsafe extern fn(usize, usize) -> *mut c_void =
+            jemalloc_sys::aligned_alloc;
+        #[used]
+        static _F4: unsafe extern fn(usize) -> *mut c_void =
+            jemalloc_sys::malloc;
+        #[used]
+        static _F5: unsafe extern fn(*mut c_void, usize) -> *mut c_void =
+            jemalloc_sys::realloc;
+        #[used]
+        static _F6: unsafe extern fn(*mut c_void) =
+            jemalloc_sys::free;
+    }
 
-fn main() {
     rustc_driver::set_sigpipe_handler();
     rustc_driver::main()
 }