diff --git a/Cargo.toml b/Cargo.toml
index e409225..4c51911 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "stuff"
 version = "0.1.4"
-edition = "2021"
+edition = "2018"
 description = "Stuffing things into pointers."
 readme = "./README.md"
 homepage = "https://github.com/Nilstrieb/stuff"
diff --git a/src/lib.rs b/src/lib.rs
index 04d7fe9..8029cdd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 #![no_std]
 #![warn(rust_2018_idioms)]
-#![deny(unsafe_op_in_unsafe_fn)]
+#![cfg_attr(test, deny(unsafe_op_in_unsafe_fn))] // this is great, but MSRV :(
 #![warn(missing_docs)]
 
 //! A crate for stuffing things into a pointer.