diff --git a/src/test/bench/shootout-k-nucleotide.rs b/src/test/bench/shootout-k-nucleotide.rs
index 7075304fa288..83af47e8d508 100644
--- a/src/test/bench/shootout-k-nucleotide.rs
+++ b/src/test/bench/shootout-k-nucleotide.rs
@@ -1,3 +1,5 @@
+// xfail-pretty
+
 // multi tasking k-nucleotide
 
 import io::reader_util;