diff --git a/tests/by-util/test_du.rs b/tests/by-util/test_du.rs
index 5d0c23f78..081a6016f 100644
--- a/tests/by-util/test_du.rs
+++ b/tests/by-util/test_du.rs
@@ -546,6 +546,17 @@ fn test_du_threshold() {
         .stdout_contains("deeper_dir");
 }
 
+#[test]
+fn test_du_invalid_threshold() {
+    let ts = TestScenario::new(util_name!());
+
+    let threshold = "-0";
+
+    ts.ucmd()
+        .arg(format!("--threshold={threshold}"))
+        .fails();
+}
+
 #[test]
 fn test_du_apparent_size() {
     let ts = TestScenario::new(util_name!());