diff --git a/mantis/build.rs b/mantis/build.rs
index 2187468..73a0c1a 100644
--- a/mantis/build.rs
+++ b/mantis/build.rs
@@ -37,6 +37,12 @@ fn main() {
     println!("cargo:rustc-env=DB_PATH={}", db_dir.display());
     println!("cargo:rustc-env=RULE_EVE_PATH={}", suricata_eve_socket.display());
 
+    // Watch output artifacts: if they are missing Cargo treats the path as non-existent
+    // and unconditionally re-runs this script, which is exactly what we want after a
+    // git clean, fresh clone, or manual deletion.
+    println!("cargo:rerun-if-changed={}", ingress_edpf_dir.display());
+    println!("cargo:rerun-if-changed={}", egress_edpf_dir.display());
+
     for item in &[
         "src",
         "public",