diff --git a/src/lib.rs b/src/lib.rs
index 02c5ef1..8cd816c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -139,6 +139,7 @@
 //! [#6]: https://github.com/dtolnay/mashup/issues/6
 
 #![doc(html_root_url = "https://docs.rs/mashup/0.1.5")]
+#![no_std]
 
 #[macro_use]
 extern crate proc_macro_hack;