diff --git a/src/smalloc.cc b/src/smalloc.cc
index eda13c7e457fa4..89461959dd8912 100644
--- a/src/smalloc.cc
+++ b/src/smalloc.cc
@@ -509,6 +509,56 @@ RetainedObjectInfo* WrapperInfo(uint16_t class_id, Handle<Value> wrapper) {
 }
 
 
+// User facing API.
+
+void Alloc(Isolate* isolate,
+           Handle<Object> obj,
+           size_t length,
+           enum ExternalArrayType type) {
+  Alloc(Environment::GetCurrent(isolate), obj, length, type);
+}
+
+
+void Alloc(Isolate* isolate,
+           Handle<Object> obj,
+           char* data,
+           size_t length,
+           enum ExternalArrayType type) {
+  Alloc(Environment::GetCurrent(isolate), obj, data, length, type);
+}
+
+
+void Alloc(Isolate* isolate,
+           Handle<Object> obj,
+           size_t length,
+           FreeCallback fn,
+           void* hint,
+           enum ExternalArrayType type) {
+  Alloc(Environment::GetCurrent(isolate), obj, length, fn, hint, type);
+}
+
+
+void Alloc(Isolate* isolate,
+           Handle<Object> obj,
+           char* data,
+           size_t length,
+           FreeCallback fn,
+           void* hint,
+           enum ExternalArrayType type) {
+  Alloc(Environment::GetCurrent(isolate), obj, data, length, fn, hint, type);
+}
+
+
+void AllocDispose(Isolate* isolate, Handle<Object> obj) {
+  AllocDispose(Environment::GetCurrent(isolate), obj);
+}
+
+
+bool HasExternalData(Isolate* isolate, Local<Object> obj) {
+  return HasExternalData(Environment::GetCurrent(isolate), obj);
+}
+
+
 void Initialize(Handle<Object> exports,
                 Handle<Value> unused,
                 Handle<Context> context) {
diff --git a/src/smalloc.h b/src/smalloc.h
index 27c7ec6b6122d9..a2d0f978a23973 100644
--- a/src/smalloc.h
+++ b/src/smalloc.h
@@ -49,30 +49,31 @@ NODE_EXTERN size_t ExternalArraySize(enum v8::ExternalArrayType type);
  *        v8::kExternalFloatArray);
  *    v8::Local<v8::Object> obj = v8::Object::New();
  *    char* data = static_cast<char*>(malloc(byte_length * array_length));
- *    node::smalloc::Alloc(env, obj, data, byte_length, v8::kExternalFloatArray);
+ *    node::smalloc::Alloc(isolate, obj, data, byte_length,
+ *                         v8::kExternalFloatArray);
  *    obj->Set(v8::String::NewFromUtf8("length"),
  *             v8::Integer::NewFromUnsigned(array_length));
  * \code
  */
-NODE_EXTERN void Alloc(Environment* env,
+NODE_EXTERN void Alloc(v8::Isolate* isolate,
                        v8::Handle<v8::Object> obj,
                        size_t length,
                        enum v8::ExternalArrayType type =
                        v8::kExternalUnsignedByteArray);
-NODE_EXTERN void Alloc(Environment* env,
+NODE_EXTERN void Alloc(v8::Isolate* isolate,
                        v8::Handle<v8::Object> obj,
                        char* data,
                        size_t length,
                        enum v8::ExternalArrayType type =
                        v8::kExternalUnsignedByteArray);
-NODE_EXTERN void Alloc(Environment* env,
+NODE_EXTERN void Alloc(v8::Isolate* isolate,
                        v8::Handle<v8::Object> obj,
                        size_t length,
                        FreeCallback fn,
                        void* hint,
                        enum v8::ExternalArrayType type =
                        v8::kExternalUnsignedByteArray);
-NODE_EXTERN void Alloc(Environment* env,
+NODE_EXTERN void Alloc(v8::Isolate* isolate,
                        v8::Handle<v8::Object> obj,
                        char* data,
                        size_t length,
@@ -85,13 +86,45 @@ NODE_EXTERN void Alloc(Environment* env,
  * Free memory associated with an externally allocated object. If no external
  * memory is allocated to the object then nothing will happen.
  */
-NODE_EXTERN void AllocDispose(Environment* env, v8::Handle<v8::Object> obj);
+NODE_EXTERN void AllocDispose(v8::Isolate* isolate, v8::Handle<v8::Object> obj);
 
 
 /**
  * Check if the Object has externally allocated memory.
  */
-NODE_EXTERN bool HasExternalData(Environment* env, v8::Local<v8::Object> obj);
+NODE_EXTERN bool HasExternalData(v8::Isolate* isolate,
+                                 v8::Local<v8::Object> obj);
+
+
+// Internal use
+void Alloc(Environment* env,
+           v8::Handle<v8::Object> obj,
+           size_t length,
+           enum v8::ExternalArrayType type =
+           v8::kExternalUnsignedByteArray);
+void Alloc(Environment* env,
+           v8::Handle<v8::Object> obj,
+           char* data,
+           size_t length,
+           enum v8::ExternalArrayType type =
+           v8::kExternalUnsignedByteArray);
+void Alloc(Environment* env,
+           v8::Handle<v8::Object> obj,
+           size_t length,
+           FreeCallback fn,
+           void* hint,
+           enum v8::ExternalArrayType type =
+           v8::kExternalUnsignedByteArray);
+void Alloc(Environment* env,
+           v8::Handle<v8::Object> obj,
+           char* data,
+           size_t length,
+           FreeCallback fn,
+           void* hint,
+           enum v8::ExternalArrayType type =
+           v8::kExternalUnsignedByteArray);
+void AllocDispose(Environment* env, v8::Handle<v8::Object> obj);
+bool HasExternalData(Environment* env, v8::Local<v8::Object> obj);
 
 }  // namespace smalloc
 }  // namespace node
diff --git a/test/addons/smalloc-alloc/binding.cc b/test/addons/smalloc-alloc/binding.cc
new file mode 100644
index 00000000000000..6efde5d6d36e70
--- /dev/null
+++ b/test/addons/smalloc-alloc/binding.cc
@@ -0,0 +1,30 @@
+#include <node.h>
+#include <smalloc.h>
+#include <v8.h>
+
+using namespace v8;
+
+void Alloc(const FunctionCallbackInfo<Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  Local<Object> obj = Object::New(isolate);
+  size_t len = args[0]->Uint32Value();
+  node::smalloc::Alloc(isolate, obj, len);
+  args.GetReturnValue().Set(obj);
+}
+
+void Dispose(const FunctionCallbackInfo<Value>& args) {
+  node::smalloc::AllocDispose(args.GetIsolate(), args[0].As<Object>());
+}
+
+void HasExternalData(const FunctionCallbackInfo<Value>& args) {
+  args.GetReturnValue().Set(
+      node::smalloc::HasExternalData(args.GetIsolate(), args[0].As<Object>()));
+}
+
+void init(Handle<Object> target) {
+  NODE_SET_METHOD(target, "alloc", Alloc);
+  NODE_SET_METHOD(target, "dispose", Dispose);
+  NODE_SET_METHOD(target, "hasExternalData", HasExternalData);
+}
+
+NODE_MODULE(binding, init);
diff --git a/test/addons/smalloc-alloc/binding.gyp b/test/addons/smalloc-alloc/binding.gyp
new file mode 100644
index 00000000000000..3bfb84493f3e87
--- /dev/null
+++ b/test/addons/smalloc-alloc/binding.gyp
@@ -0,0 +1,8 @@
+{
+  'targets': [
+    {
+      'target_name': 'binding',
+      'sources': [ 'binding.cc' ]
+    }
+  ]
+}
diff --git a/test/addons/smalloc-alloc/test.js b/test/addons/smalloc-alloc/test.js
new file mode 100644
index 00000000000000..47197be631ed17
--- /dev/null
+++ b/test/addons/smalloc-alloc/test.js
@@ -0,0 +1,9 @@
+var assert = require('assert');
+var binding = require('./build/Release/binding');
+var obj = binding.alloc(16);
+for (var i = 0; i < 16; i++) {
+  assert.ok(typeof obj[i] == 'number');
+}
+assert.ok(binding.hasExternalData(obj));
+binding.dispose(obj);
+assert.ok(typeof obj[0] !== 'number');