diff --git a/Cargo.toml b/Cargo.toml
index 2529fb7..dc52942 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,7 @@ version = "1.0.5"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 links = "cplusplus"
 edition = "2018"
+rust-version = "1.34"
 license = "MIT OR Apache-2.0"
 description = "Link libstdc++ or libc++ automatically or manually"
 repository = "https://github.com/dtolnay/link-cplusplus"