diff --git a/src/lib.rs b/src/lib.rs
index 3d4d185..9081ecf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+extern crate proc_macro;
 use proc_macro::TokenStream;
 use proc_macro2::{Delimiter, Group, TokenStream as TokenStream2, TokenTree};
 use quote::quote;