--- include/jemalloc/internal/jemalloc_internal.h.in.orig	2012-05-14 08:29:24.332065965 +0200
+++ include/jemalloc/internal/jemalloc_internal.h.in	2012-05-14 08:29:39.483118492 +0200
@@ -276,7 +276,7 @@
 #  ifdef __powerpc__
 #    define LG_QUANTUM		4
 #  endif
-#  ifdef __s390x__
+#  ifdef __s390__
 #    define LG_QUANTUM		4
 #  endif
 #  ifdef __SH4__