diff --git a/Cargo.lock b/Cargo.lock
index 679a02441c486..5aeda8f6aec00 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1044,12 +1044,6 @@ dependencies = [
  "winapi 0.3.6",
 ]
 
-[[package]]
-name = "fs_extra"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f2a4a2034423744d2cc7ca2068453168dcdb82c438419e639a26bd87839c674"
-
 [[package]]
 name = "fst"
 version = "0.3.0"
@@ -1491,17 +1485,6 @@ version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
 
-[[package]]
-name = "jemalloc-sys"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bef0d4ce37578dfd80b466e3d8324bd9de788e249f1accebb0c472ea4b52bdc"
-dependencies = [
- "cc",
- "fs_extra",
- "libc",
-]
-
 [[package]]
 name = "jobserver"
 version = "0.1.16"
@@ -1926,6 +1909,16 @@ dependencies = [
  "rustc_version",
 ]
 
+[[package]]
+name = "mimalloc-sys"
+version = "0.1.6-dev"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8943b38257eabf485d80499e273afbcbec16b1b581efc611230e3cda8c9b5e40"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.13"
@@ -3193,7 +3186,7 @@ dependencies = [
 name = "rustc-main"
 version = "0.0.0"
 dependencies = [
- "jemalloc-sys",
+ "mimalloc-sys",
  "rustc_codegen_ssa",
  "rustc_driver",
  "rustc_target",
diff --git a/src/rustc/Cargo.toml b/src/rustc/Cargo.toml
index 997d139383798..825e3655ac3b9 100644
--- a/src/rustc/Cargo.toml
+++ b/src/rustc/Cargo.toml
@@ -16,10 +16,19 @@ rustc_driver = { path = "../librustc_driver" }
 # crate is intended to be used by codegen backends, which may not be in-tree.
 rustc_codegen_ssa = { path = "../librustc_codegen_ssa" }
 
-[dependencies.jemalloc-sys]
-version = '0.3.0'
+#[dependencies.jemalloc-sys]
+#version = '0.3.0'
+#optional = true
+#features = ['unprefixed_malloc_on_supported_platforms']
+
+[dependencies.mimalloc-sys]
+version = '=0.1.6-dev'
 optional = true
-features = ['unprefixed_malloc_on_supported_platforms']
 
 [features]
-jemalloc = ['jemalloc-sys']
+jemalloc = [
+  'mimalloc-sys',
+  'mimalloc-sys/override',
+  # 'mimalloc-sys/secure', #FIXME: disable secure build
+  'mimalloc-sys/check_full'
+]
diff --git a/src/rustc/rustc.rs b/src/rustc/rustc.rs
index 4a1786f89ed55..4084c8736d74e 100644
--- a/src/rustc/rustc.rs
+++ b/src/rustc/rustc.rs
@@ -1,34 +1,34 @@
 fn main() {
-    // Pull in jemalloc when enabled.
+    // Pull in mimalloc when enabled.
     //
-    // Note that we're pulling in a static copy of jemalloc which means that to
+    // Note that we're pulling in a static copy of mimalloc 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
+    // dynamic libraries. That means to pull in mimalloc 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")]
+    #[cfg(feature = "mimalloc-sys")]
     {
         use std::os::raw::{c_void, c_int};
 
         #[used]
         static _F1: unsafe extern fn(usize, usize) -> *mut c_void =
-            jemalloc_sys::calloc;
+            mimalloc_sys::calloc;
         #[used]
         static _F2: unsafe extern fn(*mut *mut c_void, usize, usize) -> c_int =
-            jemalloc_sys::posix_memalign;
+            mimalloc_sys::posix_memalign;
         #[used]
         static _F3: unsafe extern fn(usize, usize) -> *mut c_void =
-            jemalloc_sys::aligned_alloc;
+            mimalloc_sys::aligned_alloc;
         #[used]
         static _F4: unsafe extern fn(usize) -> *mut c_void =
-            jemalloc_sys::malloc;
+            mimalloc_sys::malloc;
         #[used]
         static _F5: unsafe extern fn(*mut c_void, usize) -> *mut c_void =
-            jemalloc_sys::realloc;
+            mimalloc_sys::realloc;
         #[used]
         static _F6: unsafe extern fn(*mut c_void) =
-            jemalloc_sys::free;
+            mimalloc_sys::free;
     }
 
     rustc_driver::set_sigpipe_handler();