diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1146ed1..424f50ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+- Add `extern crate proc_macro;` to solve some weird problem (https://github.com/idanarye/rust-typed-builder/issues/57)
+
 ## 0.9.0 - 2021-01-31
 ### Added
 - Builder type implements `Clone` when all set fields support clone.
diff --git a/src/lib.rs b/src/lib.rs
index 884f4e18..4bb18269 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+extern crate proc_macro; // Needed even though it's the 2018 edition. See https://github.com/idanarye/rust-typed-builder/issues/57.
+
 use proc_macro2::TokenStream;
 
 use syn::parse::Error;