diff --git a/src/test/bench/task-perf-word-count-generic.rs b/src/test/bench/task-perf-word-count-generic.rs
index 62aa4d75f20b2..3febde84f1dbb 100644
--- a/src/test/bench/task-perf-word-count-generic.rs
+++ b/src/test/bench/task-perf-word-count-generic.rs
@@ -1,3 +1,4 @@
+// xfail-test
 /**
    A parallel word-frequency counting program.
 
diff --git a/src/test/bench/task-perf-word-count.rs b/src/test/bench/task-perf-word-count.rs
index 6dcc1fd876df1..d238889236b42 100644
--- a/src/test/bench/task-perf-word-count.rs
+++ b/src/test/bench/task-perf-word-count.rs
@@ -1,3 +1,4 @@
+// xfail-test
 /**
    A parallel word-frequency counting program.