1 files changed, 1 insertions, 1 deletions
diff --git a/HAMM.rs b/HAMM.rs
index a1b2afe..7cea27d 100644
--- a/HAMM.rs
+++ b/HAMM.rs
@@ -5,7 +5,7 @@ use rosalind::str::hamming;
 fn main() {
     let dna1 = input_line();
     let dna2 = input_line();
-    assert str::len(dna1) == str::len(dna2);
+    fail_unless!(str::len(dna1) == str::len(dna2));
 
     io::println(fmt!("%d", hamming(dna1, dna2)));
 }