diff --git a/nac3core/build.rs b/nac3core/build.rs
index 12a4bbb2..f3e18c6d 100644
--- a/nac3core/build.rs
+++ b/nac3core/build.rs
@@ -37,7 +37,7 @@ fn compile_irrt(irrt_dir: &Path, out_dir: &Path) {
         "-",
     ];
 
-    println!("cargo:rerun-if-changed={path}", path = irrt_cpp_path.to_str().unwrap());
+    println!("cargo:rerun-if-changed={}", out_dir.to_str().unwrap());
 
     let output = Command::new("clang-irrt")
         .args(flags)