diff --git a/build.rs b/build.rs
index 3fcaaf9..c8cc44a 100644
--- a/build.rs
+++ b/build.rs
@@ -2,4 +2,6 @@ use std::env;
 
 fn main() {
     println!("cargo:rustc-env=HOST={}", env::var("TARGET").unwrap());
+    // Prevents cargo from scanning the whole directory for changes.
+    println!("cargo:rerun-if-changed=build.rs");
 }