diff --git a/helgrind/tests/annotate_hbefore.vgtest b/helgrind/tests/annotate_hbefore.vgtest
index 1e3793952..9dc936b24 100644
--- a/helgrind/tests/annotate_hbefore.vgtest
+++ b/helgrind/tests/annotate_hbefore.vgtest
@@ -1,2 +1,3 @@
+prereq:  (../../tests/arch_test s390x; if [ $? = 0 ]; then false; else true; fi)
 vgopts: -q
 prog: annotate_hbefore