diff --git a/src/test.rs b/src/test.rs
index bb99d102..a7ac4fcf 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -443,6 +443,21 @@ fn test_compare_reference_impl() {
     }
 }
 
+#[test]
+fn test_compare_reference_impl_long_xof() {
+    let mut reference_output = [0u8; 32 * BLOCK_LEN - 1];
+    let mut reference_hasher = reference_impl::Hasher::new_keyed(&TEST_KEY);
+    reference_hasher.update(b"hello world");
+    reference_hasher.finalize(&mut reference_output);
+
+    let mut test_output = [0u8; 32 * BLOCK_LEN - 1];
+    let mut test_hasher = crate::Hasher::new_keyed(&TEST_KEY);
+    test_hasher.update(b"hello world");
+    test_hasher.finalize_xof().fill(&mut test_output);
+
+    assert_eq!(reference_output, test_output);
+}
+
 #[test]
 fn test_xof_partial_blocks() {
     const OUT_LEN: usize = 6 * BLOCK_LEN;