diff --git a/build.rs b/build.rs
index f8a847abe299..9edbf361e86e 100644
--- a/build.rs
+++ b/build.rs
@@ -86,6 +86,8 @@ fn test_directory(
     strategy: &str,
 ) -> anyhow::Result<usize> {
     let path = path.as_ref();
+    println!("cargo:rerun-if-changed={}", path.display());
+
     let mut dir_entries: Vec<_> = path
         .read_dir()
         .context(format!("failed to read {:?}", path))?
@@ -148,6 +150,8 @@ fn write_testsuite_tests(
     strategy: &str,
 ) -> anyhow::Result<()> {
     let path = path.as_ref();
+    println!("cargo:rerun-if-changed={}", path.display());
+
     let testname = extract_name(path);
 
     writeln!(out, "#[test]")?;