diff --git a/src/naive/datetime/tests.rs b/src/naive/datetime/tests.rs
index 3df475b9c1..806268d817 100644
--- a/src/naive/datetime/tests.rs
+++ b/src/naive/datetime/tests.rs
@@ -29,6 +29,16 @@ fn test_datetime_from_timestamp_millis() {
         let naive_datetime = NaiveDateTime::from_timestamp_millis(timestamp_millis);
         assert!(naive_datetime.is_none());
     }
+
+    // Test that the result of `from_timestamp_millis` compares equal to
+    // that of `from_timestamp_opt`.
+    let secs_test = [0, 1, 2, 1000, 1234, 12345678, -1, -2, -1000, -12345678];
+    for secs in secs_test.iter().cloned() {
+        assert_eq!(
+            NaiveDateTime::from_timestamp_millis(secs * 1000),
+            NaiveDateTime::from_timestamp_opt(secs, 0)
+        );
+    }
 }
 
 #[test]