diff --git a/build.rs b/build.rs
index 7072aac..bdc30a8 100644
--- a/build.rs
+++ b/build.rs
@@ -1,5 +1,6 @@
 fn main() {
     // Warning: build.rs is not published to crates.io.
 
+    println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rustc-check-cfg=cfg(async_trait_nightly_testing)");
 }