diff --git a/.gitignore b/.gitignore
index 9c6831e9..5810b5b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@ Cargo.lock
 build/
 __pycache__/
 .cache
+.pytest_cache/
+dist/
 
 *.so
 *.out
diff --git a/Cargo.toml b/Cargo.toml
index 4c4746cd..73497f60 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 = { version = "^0.2.1" }
+pyo3cls = { path = "pyo3cls", version = "^0.2.1" }
 
 [build-dependencies]
 regex = "0.2"
diff --git a/pyo3cls/src/lib.rs b/pyo3cls/src/lib.rs
index aea0529e..4ac5674d 100644
--- a/pyo3cls/src/lib.rs
+++ b/pyo3cls/src/lib.rs
@@ -34,7 +34,7 @@ pub fn mod2init(attr: TokenStream, input: TokenStream) -> TokenStream {
     let mut ast = syn::parse_item(&source).unwrap();
 
     // Build the output
-    let init = module::build_py2_module_init(&mut ast, attr.to_string());
+    let init = module::build_py2_module_init(&mut ast, utils::attr_with_parentheses(attr));
 
     // Return the generated impl as a TokenStream
     let mut tokens = Tokens::new();
@@ -53,7 +53,7 @@ pub fn mod3init(attr: TokenStream, input: TokenStream) -> TokenStream {
     let mut ast = syn::parse_item(&source).unwrap();
 
     // Build the output
-    let init = module::build_py3_module_init(&mut ast, attr.to_string());
+    let init = module::build_py3_module_init(&mut ast, utils::attr_with_parentheses(attr));
 
     // Return the generated impl as a TokenStream
     let mut tokens = Tokens::new();
@@ -91,7 +91,7 @@ pub fn class(attr: TokenStream, input: TokenStream) -> TokenStream {
     let mut ast = syn::parse_derive_input(&source).unwrap();
 
     // Build the output
-    let expanded = py_class::build_py_class(&mut ast, attr.to_string());
+    let expanded = py_class::build_py_class(&mut ast, utils::attr_with_parentheses(attr));
 
     // Return the generated impl as a TokenStream
     let mut tokens = Tokens::new();
diff --git a/pyo3cls/src/module.rs b/pyo3cls/src/module.rs
index 0aa9993d..24264641 100644
--- a/pyo3cls/src/module.rs
+++ b/pyo3cls/src/module.rs
@@ -10,7 +10,7 @@ use utils;
 
 
 pub fn build_py3_module_init(ast: &mut syn::Item, attr: String) -> Tokens {
-    let modname = &attr.to_string()[1..attr.to_string().len()-1].to_string();
+    let modname = &attr[1..attr.len()-1].to_string();
 
     match ast.node {
         syn::ItemKind::Fn(_, _, _, _, _, ref mut block) => {
@@ -86,7 +86,7 @@ pub fn py3_init(fnname: &syn::Ident, name: &String, doc: syn::Lit) -> Tokens {
 }
 
 pub fn build_py2_module_init(ast: &mut syn::Item, attr: String) -> Tokens {
-    let modname = &attr.to_string()[1..attr.to_string().len()-1].to_string();
+    let modname = &attr[1..attr.len()-1].to_string();
 
     match ast.node {
         syn::ItemKind::Fn(_, _, _, _, _, ref mut block) => {
diff --git a/pyo3cls/src/utils.rs b/pyo3cls/src/utils.rs
index f0c10124..aed9ed20 100644
--- a/pyo3cls/src/utils.rs
+++ b/pyo3cls/src/utils.rs
@@ -1,8 +1,23 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 use syn;
 use quote::{Tokens, ToTokens};
+use proc_macro::TokenStream;
 
 
+/// https://github.com/rust-lang/rust/pull/50120 removed the parantheses from
+/// the attr TokenStream, so we need to re-add them manually.
+///
+/// nightly-2018-04-05: ( name=CustomName )
+/// nightly-2018-04-28: name=CustomName
+pub fn attr_with_parentheses(attr: TokenStream) -> String {
+    let attr = attr.to_string();
+    if attr.len() > 0 && !attr.starts_with("(") {
+        return format!("({})", attr);
+    } else {
+        return attr;
+    }
+}
+
 pub fn print_err(msg: String, t: Tokens) {
     println!("Error: {} in '{}'", msg, t.to_string());
 }
diff --git a/tests/test_module.rs b/tests/test_module.rs
index 730da0e0..95562864 100644
--- a/tests/test_module.rs
+++ b/tests/test_module.rs
@@ -36,6 +36,7 @@ fn init_mod(py: Python, m: &PyModule) -> PyResult<()> {
 }
 
 #[test]
+#[cfg(Py_3)]
 fn test_module_with_functions() {
     let gil = Python::acquire_gil();
     let py = gil.python();