diff --git a/libmodulemd.spec b/libmodulemd.spec
index df4db56..6eaf9a4 100644
--- a/libmodulemd.spec
+++ b/libmodulemd.spec
@@ -105,7 +105,7 @@ Python 3 bindings for libmodulemd1
 
 export LC_CTYPE=C.utf8
 
-%ifarch %{power64}
+%ifarch %{power64} s390x
 # Valgrind is broken on ppc64[le] with GCC7:
 # https://bugs.kde.org/show_bug.cgi?id=386945
 export MMD_SKIP_VALGRIND=1