diff --git a/Cargo.toml b/Cargo.toml
index 800ea95f..a565374a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ log = "0.4"
 libc = "0.2"
 spin = "0.4.6"
 num-traits = "0.2"
-pyo3cls = { path = "pyo3cls", version = "^0.2.1" }
+pyo3cls = { path = "pyo3cls", version = "0.2.5" }
 
 [dev-dependencies]
 docmatic = "^0.1.2"
diff --git a/pyo3-derive-backend/Cargo.toml b/pyo3-derive-backend/Cargo.toml
new file mode 100644
index 00000000..130b19df
--- /dev/null
+++ b/pyo3-derive-backend/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "pyo3-derive-backend"
+version = "0.2.5"
+description = "Code generation for PyO3 package"
+authors = ["PyO3 Project and Contributors <https://github.com/PyO3"]
+homepage = "https://github.com/pyo3/pyo3"
+repository = "https://github.com/pyo3/pyo3.git"
+documentation = "http://pyo3.github.io/PyO3/pyo3/"
+categories = ["api-bindings", "development-tools::ffi"]
+license = "Apache-2.0"
+
+[dependencies]
+quote="0.3"
+log="0.4"
+
+[dependencies.syn]
+version="0.11"
+features=["full"]
diff --git a/pyo3cls/src/args.rs b/pyo3-derive-backend/src/args.rs
similarity index 100%
rename from pyo3cls/src/args.rs
rename to pyo3-derive-backend/src/args.rs
diff --git a/pyo3cls/src/defs.rs b/pyo3-derive-backend/src/defs.rs
similarity index 100%
rename from pyo3cls/src/defs.rs
rename to pyo3-derive-backend/src/defs.rs
diff --git a/pyo3cls/src/func.rs b/pyo3-derive-backend/src/func.rs
similarity index 100%
rename from pyo3cls/src/func.rs
rename to pyo3-derive-backend/src/func.rs
diff --git a/pyo3-derive-backend/src/lib.rs b/pyo3-derive-backend/src/lib.rs
new file mode 100644
index 00000000..1178fb75
--- /dev/null
+++ b/pyo3-derive-backend/src/lib.rs
@@ -0,0 +1,21 @@
+// Copyright (c) 2017-present PyO3 Project and Contributors
+
+#![recursion_limit = "1024"]
+
+#[macro_use]
+extern crate log;
+#[macro_use]
+extern crate quote;
+extern crate syn;
+extern crate proc_macro;
+
+pub mod py_class;
+pub mod py_impl;
+pub mod py_proto;
+pub mod py_method;
+pub mod args;
+pub mod defs;
+pub mod func;
+pub mod method;
+pub mod module;
+pub mod utils;
diff --git a/pyo3cls/src/method.rs b/pyo3-derive-backend/src/method.rs
similarity index 100%
rename from pyo3cls/src/method.rs
rename to pyo3-derive-backend/src/method.rs
diff --git a/pyo3cls/src/module.rs b/pyo3-derive-backend/src/module.rs
similarity index 99%
rename from pyo3cls/src/module.rs
rename to pyo3-derive-backend/src/module.rs
index 24264641..dd9601ca 100644
--- a/pyo3cls/src/module.rs
+++ b/pyo3-derive-backend/src/module.rs
@@ -44,7 +44,6 @@ pub fn py3_init(fnname: &syn::Ident, name: &String, doc: syn::Lit) -> Tokens {
         #[no_mangle]
         #[allow(non_snake_case, unused_imports)]
         pub unsafe extern "C" fn #cb_name() -> *mut ::pyo3::ffi::PyObject {
-            extern crate pyo3;
             use std;
             use pyo3::{IntoPyPointer, ObjectProtocol};
 
@@ -121,7 +120,6 @@ pub fn py2_init(fnname: &syn::Ident, name: &String, doc: syn::Lit) -> Tokens {
         #[no_mangle]
         #[allow(non_snake_case, unused_imports)]
         pub unsafe extern "C" fn #cb_name() {
-            extern crate pyo3;
             use std;
 
             // initialize python
diff --git a/pyo3cls/src/py_class.rs b/pyo3-derive-backend/src/py_class.rs
similarity index 99%
rename from pyo3cls/src/py_class.rs
rename to pyo3-derive-backend/src/py_class.rs
index 487229d4..16f2812b 100644
--- a/pyo3cls/src/py_class.rs
+++ b/pyo3-derive-backend/src/py_class.rs
@@ -41,7 +41,7 @@ pub fn build_py_class(ast: &mut syn::DeriveInput, attr: String) -> Tokens {
                 unused_qualifications, unused_variables, non_camel_case_types)]
         const #dummy_const: () = {
             use std;
-            extern crate pyo3 as _pyo3;
+            use pyo3 as _pyo3;
 
             #tokens
         };
@@ -372,7 +372,7 @@ fn impl_descriptors(cls: &syn::Ty, descriptors: Vec<(syn::Field, Vec<FnType>)>)
         #[allow(non_upper_case_globals, unused_attributes,
                 unused_qualifications, unused_variables, unused_imports)]
         const #dummy_const: () = {
-            extern crate pyo3 as _pyo3;
+            use pyo3 as _pyo3;
 
             #tokens
         };
diff --git a/pyo3cls/src/py_impl.rs b/pyo3-derive-backend/src/py_impl.rs
similarity index 97%
rename from pyo3cls/src/py_impl.rs
rename to pyo3-derive-backend/src/py_impl.rs
index 025a0f7a..c53ac69b 100644
--- a/pyo3cls/src/py_impl.rs
+++ b/pyo3-derive-backend/src/py_impl.rs
@@ -57,7 +57,7 @@ fn impl_methods(ty: &Box<syn::Ty>, impls: &mut Vec<syn::ImplItem>) -> Tokens {
         #[allow(non_upper_case_globals, unused_attributes,
                 unused_qualifications, unused_variables, unused_imports)]
         const #dummy_const: () = {
-            extern crate pyo3 as _pyo3;
+            use pyo3 as _pyo3;
 
             #tokens
         };
diff --git a/pyo3cls/src/py_method.rs b/pyo3-derive-backend/src/py_method.rs
similarity index 100%
rename from pyo3cls/src/py_method.rs
rename to pyo3-derive-backend/src/py_method.rs
diff --git a/pyo3cls/src/py_proto.rs b/pyo3-derive-backend/src/py_proto.rs
similarity index 99%
rename from pyo3cls/src/py_proto.rs
rename to pyo3-derive-backend/src/py_proto.rs
index b012606e..b18b8709 100644
--- a/pyo3cls/src/py_proto.rs
+++ b/pyo3-derive-backend/src/py_proto.rs
@@ -128,7 +128,7 @@ fn impl_proto_impl(ty: &Box<syn::Ty>,
         #[allow(non_upper_case_globals, unused_attributes,
                 unused_qualifications, unused_variables)]
         const #dummy_const: () = {
-            extern crate pyo3 as _pyo3;
+            use pyo3 as _pyo3;
 
             #tokens
 
diff --git a/pyo3cls/src/utils.rs b/pyo3-derive-backend/src/utils.rs
similarity index 100%
rename from pyo3cls/src/utils.rs
rename to pyo3-derive-backend/src/utils.rs
diff --git a/pyo3cls/Cargo.toml b/pyo3cls/Cargo.toml
index b022b06f..b9c7c780 100644
--- a/pyo3cls/Cargo.toml
+++ b/pyo3cls/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3cls"
-version = "0.2.1"
+version = "0.2.5"
 description = "Proc macros for PyO3 package"
 authors = ["PyO3 Project and Contributors <https://github.com/PyO3"]
 homepage = "https://github.com/pyo3/pyo3"
@@ -14,8 +14,11 @@ proc-macro = true
 
 [dependencies]
 quote="0.3"
-log="0.4"
 
 [dependencies.syn]
 version="0.11"
 features=["full"]
+
+[dependencies.pyo3-derive-backend]
+path = "../pyo3-derive-backend"
+version = "0.2.5"
\ No newline at end of file
diff --git a/pyo3cls/src/lib.rs b/pyo3cls/src/lib.rs
index 4ac5674d..0c5ccb5d 100644
--- a/pyo3cls/src/lib.rs
+++ b/pyo3cls/src/lib.rs
@@ -5,24 +5,14 @@
 
 extern crate proc_macro;
 extern crate syn;
-#[macro_use] extern crate quote;
-#[macro_use] extern crate log;
+extern crate quote;
+extern crate pyo3_derive_backend;
 
 use std::str::FromStr;
 use proc_macro::TokenStream;
 
 use quote::{Tokens, ToTokens};
-
-mod py_class;
-mod py_impl;
-mod py_proto;
-mod py_method;
-mod args;
-mod defs;
-mod func;
-mod method;
-mod module;
-mod utils;
+use pyo3_derive_backend::*;
 
 
 #[proc_macro_attribute]