diff --git a/Cargo.toml b/Cargo.toml
index aae8eb17a..1dbf20898 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,7 @@ keywords = ["simd", "vector", "portability"]
 categories = ["hardware-support", "concurrency", "no-std", "data-structures"]
 license = "MIT/Apache-2.0"
 edition = "2018"
+build = "build.rs"
 
 [badges]
 appveyor = { repository = "rust-lang-nursery/packed_simd" }
diff --git a/build.rs b/build.rs
new file mode 100644
index 000000000..61b5330a1
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("cargo:rustc-env=RUSTC_BOOTSTRAP=1");
+}