diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
index cb6c1f35..b9c170f5 100644
--- a/tests/integration_tests.rs
+++ b/tests/integration_tests.rs
@@ -15,6 +15,8 @@ use std::convert::TryInto;
 use std::env::consts::ARCH;
 use std::thread;
 
+use libc::SYS_read;
+
 // The type of the `req` parameter is different for the `musl` library. This will enable
 // successful build for other non-musl libraries.
 #[cfg(target_env = "musl")]
@@ -789,3 +791,12 @@ fn test_filter_apply() {
     .join()
     .unwrap();
 }
+
+#[test]
+fn test_duplicate_syscall_keys_override_previous_rules() {
+    let rules = vec![(SYS_read, 1), (SYS_read, 2)];
+
+    let map: BTreeMap<_, _> = rules.into_iter().collect();
+
+    assert_eq!(map.len(), 1);
+}