diff --git a/src/Cargo.lock b/src/Cargo.lock
index 6e7c4b67acf..f573abadc31 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -19,7 +19,6 @@ dependencies = [
 name = "alloc_jemalloc"
 version = "0.0.0"
 dependencies = [
- "alloc 0.0.0",
  "alloc_system 0.0.0",
  "build_helper 0.1.0",
  "cc 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -32,7 +31,6 @@ dependencies = [
 name = "alloc_system"
 version = "0.0.0"
 dependencies = [
- "alloc 0.0.0",
  "compiler_builtins 0.0.0",
  "core 0.0.0",
  "dlmalloc 0.0.0",
diff --git a/src/liballoc/alloc.rs b/src/liballoc/alloc.rs
index 12ee7701903..00a8b2c0e25 100644
--- a/src/liballoc/alloc.rs
+++ b/src/liballoc/alloc.rs
@@ -22,11 +22,6 @@ use core::usize;
 #[doc(inline)]
 pub use core::alloc::*;
 
-#[doc(hidden)]
-pub mod __core {
-    pub use core::*;
-}
-
 extern "Rust" {
     #[allocator]
     #[rustc_allocator_nounwind]
diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
new file mode 100644
index 00000000000..a44ff04bd1b
--- /dev/null
+++ b/src/liballoc/heap.rs
@@ -0,0 +1,98 @@
+// Copyright 2014-2015 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.
+
+pub use alloc::{Excess, Layout, AllocErr, CannotReallocInPlace};
+use core::alloc::Alloc as CoreAlloc;
+
+#[doc(hidden)]
+pub mod __core {
+    pub use core::*;
+}
+
+/// Compatibility with older versions of #[global_allocator] during bootstrap
+pub unsafe trait Alloc {
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr>;
+    unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout);
+    fn oom(&mut self, err: AllocErr) -> !;
+    fn usable_size(&self, layout: &Layout) -> (usize, usize);
+    unsafe fn realloc(&mut self,
+                      ptr: *mut u8,
+                      layout: Layout,
+                      new_layout: Layout) -> Result<*mut u8, AllocErr>;
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<*mut u8, AllocErr>;
+    unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr>;
+    unsafe fn realloc_excess(&mut self,
+                             ptr: *mut u8,
+                             layout: Layout,
+                             new_layout: Layout) -> Result<Excess, AllocErr>;
+    unsafe fn grow_in_place(&mut self,
+                            ptr: *mut u8,
+                            layout: Layout,
+                            new_layout: Layout) -> Result<(), CannotReallocInPlace>;
+    unsafe fn shrink_in_place(&mut self,
+                              ptr: *mut u8,
+                              layout: Layout,
+                              new_layout: Layout) -> Result<(), CannotReallocInPlace>;
+}
+
+#[allow(deprecated)]
+unsafe impl<T> Alloc for T where T: CoreAlloc {
+    unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
+        CoreAlloc::alloc(self, layout)
+    }
+
+    unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
+        CoreAlloc::dealloc(self, ptr, layout)
+    }
+
+    fn oom(&mut self, err: AllocErr) -> ! {
+        CoreAlloc::oom(self, err)
+    }
+
+    fn usable_size(&self, layout: &Layout) -> (usize, usize) {
+        CoreAlloc::usable_size(self, layout)
+    }
+
+    unsafe fn realloc(&mut self,
+                      ptr: *mut u8,
+                      layout: Layout,
+                      new_layout: Layout) -> Result<*mut u8, AllocErr> {
+        CoreAlloc::realloc(self, ptr, layout, new_layout)
+    }
+
+    unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
+        CoreAlloc::alloc_zeroed(self, layout)
+    }
+
+    unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr> {
+        CoreAlloc::alloc_excess(self, layout)
+    }
+
+    unsafe fn realloc_excess(&mut self,
+                             ptr: *mut u8,
+                             layout: Layout,
+                             new_layout: Layout) -> Result<Excess, AllocErr> {
+        CoreAlloc::realloc_excess(self, ptr, layout, new_layout)
+    }
+
+    unsafe fn grow_in_place(&mut self,
+                            ptr: *mut u8,
+                            layout: Layout,
+                            new_layout: Layout) -> Result<(), CannotReallocInPlace> {
+        CoreAlloc::grow_in_place(self, ptr, layout, new_layout)
+    }
+
+    unsafe fn shrink_in_place(&mut self,
+                              ptr: *mut u8,
+                              layout: Layout,
+                              new_layout: Layout) -> Result<(), CannotReallocInPlace> {
+        CoreAlloc::shrink_in_place(self, ptr, layout, new_layout)
+    }
+}
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 066698a71df..f6598fe5e89 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -153,10 +153,16 @@ pub mod alloc;
 #[unstable(feature = "allocator_api", issue = "32838")]
 #[rustc_deprecated(since = "1.27.0", reason = "module renamed to `alloc`")]
 /// Use the `alloc` module instead.
+#[cfg(not(stage0))]
 pub mod heap {
     pub use alloc::*;
 }
 
+#[unstable(feature = "allocator_api", issue = "32838")]
+#[rustc_deprecated(since = "1.27.0", reason = "module renamed to `alloc`")]
+#[cfg(stage0)]
+pub mod heap;
+
 // Primitive types using the heaps above
 
 // Need to conditionally define the mod from `boxed.rs` to avoid
diff --git a/src/liballoc_jemalloc/Cargo.toml b/src/liballoc_jemalloc/Cargo.toml
index fd4a4553046..02435170374 100644
--- a/src/liballoc_jemalloc/Cargo.toml
+++ b/src/liballoc_jemalloc/Cargo.toml
@@ -12,7 +12,6 @@ test = false
 doc = false
 
 [dependencies]
-alloc = { path = "../liballoc" }
 alloc_system = { path = "../liballoc_system" }
 core = { path = "../libcore" }
 libc = { path = "../rustc/libc_shim" }
diff --git a/src/liballoc_jemalloc/lib.rs b/src/liballoc_jemalloc/lib.rs
index df7e3f61f5f..616181d99bc 100644
--- a/src/liballoc_jemalloc/lib.rs
+++ b/src/liballoc_jemalloc/lib.rs
@@ -32,7 +32,7 @@ pub use contents::*;
 mod contents {
     use core::ptr;
 
-    use core::heap::{Alloc, AllocErr, Layout};
+    use core::alloc::{Alloc, AllocErr, Layout};
     use alloc_system::System;
     use libc::{c_int, c_void, size_t};
 
diff --git a/src/liballoc_system/Cargo.toml b/src/liballoc_system/Cargo.toml
index 936e20a32e1..c34e2f203a8 100644
--- a/src/liballoc_system/Cargo.toml
+++ b/src/liballoc_system/Cargo.toml
@@ -10,7 +10,6 @@ test = false
 doc = false
 
 [dependencies]
-alloc = { path = "../liballoc" }
 core = { path = "../libcore" }
 libc = { path = "../rustc/libc_shim" }
 compiler_builtins = { path = "../rustc/compiler_builtins_shim" }
diff --git a/src/liballoc_system/lib.rs b/src/liballoc_system/lib.rs
index cdcb732f635..2d5adca7fcb 100644
--- a/src/liballoc_system/lib.rs
+++ b/src/liballoc_system/lib.rs
@@ -41,7 +41,7 @@ const MIN_ALIGN: usize = 8;
 #[allow(dead_code)]
 const MIN_ALIGN: usize = 16;
 
-use core::heap::{Alloc, AllocErr, Layout, Excess, CannotReallocInPlace};
+use core::alloc::{Alloc, AllocErr, Layout, Excess, CannotReallocInPlace};
 
 #[unstable(feature = "allocator_api", issue = "32838")]
 pub struct System;
@@ -121,7 +121,7 @@ mod platform {
 
     use MIN_ALIGN;
     use System;
-    use core::heap::{Alloc, AllocErr, Layout};
+    use core::alloc::{Alloc, AllocErr, Layout};
 
     #[unstable(feature = "allocator_api", issue = "32838")]
     unsafe impl<'a> Alloc for &'a System {
@@ -283,7 +283,7 @@ mod platform {
 
     use MIN_ALIGN;
     use System;
-    use core::heap::{Alloc, AllocErr, Layout, CannotReallocInPlace};
+    use core::alloc::{Alloc, AllocErr, Layout, CannotReallocInPlace};
 
     type LPVOID = *mut u8;
     type HANDLE = LPVOID;
@@ -495,7 +495,7 @@ mod platform {
 mod platform {
     extern crate dlmalloc;
 
-    use core::heap::{Alloc, AllocErr, Layout, Excess, CannotReallocInPlace};
+    use core::alloc::{Alloc, AllocErr, Layout, Excess, CannotReallocInPlace};
     use System;
     use self::dlmalloc::GlobalDlmalloc;