diff --git a/tests/moments.rs b/tests/moments.rs
index bbe2e0c..6580199 100644
--- a/tests/moments.rs
+++ b/tests/moments.rs
@@ -43,6 +43,7 @@ fn simple() {
     assert_eq!(a.standardized_moment(1), 0.0);
     assert_eq!(a.standardized_moment(2), 1.0);
     assert_almost_eq!(a.sample_skewness(), 0.0, 1e-15);
+    assert_almost_eq!(a.standardized_moment(3), 0.0, 1e-15);
     a.add(1.0);
     // skewness
     assert_almost_eq!(a.standardized_moment(3), 0.2795084971874741, 1e-15);