diff --git a/Cargo.lock b/Cargo.lock
index 74ed0a5..6e94f21 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,4 +1,4 @@
 [[package]]
 name = "tcmalloc"
-version = "0.1.2"
+version = "0.1.3"
 
diff --git a/src/lib.rs b/src/lib.rs
index 8e2c022..9fb50d7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 #![feature(allocator_api)]
 
-use std::alloc::{GlobalAlloc, Layout, Opaque};
+use std::alloc::{GlobalAlloc, Layout};
 
 use std::os::raw::c_void;
 
@@ -15,11 +15,11 @@ extern "C" {
 pub struct TCMalloc;
 
 unsafe impl GlobalAlloc for TCMalloc {
-    unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
-        tc_memalign(layout.align(), layout.size()) as *mut Opaque
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        tc_memalign(layout.align(), layout.size()) as *mut u8
     }
 
-    unsafe fn dealloc(&self, ptr: *mut Opaque, _layout: Layout) {
+    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
         tc_free(ptr as *mut c_void);
         // tc_free_sized(ptr as *mut c_void, layout.size());
     }