diff --git a/src/librustc_llvm/build.rs b/src/librustc_llvm/build.rs
index 8656bb8bf003..10ea6459d97b 100644
--- a/src/librustc_llvm/build.rs
+++ b/src/librustc_llvm/build.rs
@@ -116,6 +116,9 @@ fn main() {
         cfg.flag("-DLLVM_RUSTLLVM");
     }
 
+    println!("cargo:rerun-if-changed=../rustllvm/PassWrapper.cpp");
+    println!("cargo:rerun-if-changed=../rustllvm/RustWrapper.cpp");
+    println!("cargo:rerun-if-changed=../rustllvm/ArchiveWrapper.cpp");
     cfg.file("../rustllvm/PassWrapper.cpp")
        .file("../rustllvm/RustWrapper.cpp")
        .file("../rustllvm/ArchiveWrapper.cpp")