diff --git a/src/test/run-pass/alt-range.rs b/src/test/run-pass/alt-range.rs
index 1cd29cb3517..1c0a3facd20 100644
--- a/src/test/run-pass/alt-range.rs
+++ b/src/test/run-pass/alt-range.rs
@@ -1,3 +1,5 @@
+// xfail-fast - more windows randomness under check-fast
+
 fn main() {
     alt 5u {
       1u to 5u {}