diff --git a/src/diag.rs b/src/diag.rs
index ba02e20..c7b7097 100644
--- a/src/diag.rs
+++ b/src/diag.rs
@@ -12,7 +12,7 @@
 //!    `.err()` on spans.
 //!
 
-use proc_macro::{Span, TokenStream};
+use crate::proc_macro::{Span, TokenStream};
 
 
 /// Extension trait that adds a convenience method to `Diagnostic`. This is
diff --git a/src/gen.rs b/src/gen.rs
index f45ca15..e768a90 100644
--- a/src/gen.rs
+++ b/src/gen.rs
@@ -1,4 +1,4 @@
-use proc_macro::Span;
+use crate::proc_macro::Span;
 use proc_macro2::TokenStream as TokenStream2;
 use quote::{ToTokens, TokenStreamExt};
 use syn::{
diff --git a/src/lib.rs b/src/lib.rs
index db2b794..109b025 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,10 +4,11 @@
 
 #![cfg_attr(feature = "nightly", feature(proc_macro_diagnostic, proc_macro_span))]
 
+extern crate proc_macro;
 #[macro_use]
 extern crate quote;
 
-use proc_macro::TokenStream;
+use crate::proc_macro::TokenStream;
 use proc_macro2::TokenStream as TokenStream2;
 use quote::ToTokens;
 
diff --git a/src/proxy.rs b/src/proxy.rs
index feb2930..16dfaab 100644
--- a/src/proxy.rs
+++ b/src/proxy.rs
@@ -1,6 +1,6 @@
 use std::iter::Peekable;
 
-use proc_macro::{token_stream, TokenStream, TokenTree};
+use crate::proc_macro::{token_stream, TokenStream, TokenTree};
 
 use crate::diag::SpanExt;
 
@@ -141,7 +141,7 @@ fn eat_type(iter: &mut Peekable<token_stream::IntoIter>) -> Result<ProxyType, ()
 
 #[cfg(test)]
 mod test {
-    use proc_macro::TokenStream;
+    use crate::proc_macro::TokenStream;
 
     use super::parse_types;
 
diff --git a/src/spanned.rs b/src/spanned.rs
index d192e14..4e8d861 100644
--- a/src/spanned.rs
+++ b/src/spanned.rs
@@ -1,4 +1,4 @@
-use proc_macro::{Span, TokenStream};
+use crate::proc_macro::{Span, TokenStream};
 use proc_macro2::TokenStream as TokenStream2;
 use quote::ToTokens;