diff -up jemalloc-2.0.1/include/jemalloc/internal/jemalloc_internal.h.in.orig jemalloc-2.0.1/include/jemalloc/internal/jemalloc_internal.h.in
--- jemalloc-2.0.1/include/jemalloc/internal/jemalloc_internal.h.in.orig	2010-12-11 14:23:59.000000000 +0100
+++ jemalloc-2.0.1/include/jemalloc/internal/jemalloc_internal.h.in	2010-12-11 14:24:04.000000000 +0100
@@ -135,7 +135,7 @@ extern void	(*JEMALLOC_P(malloc_message)
 #ifdef __powerpc__
 #  define LG_QUANTUM		4
 #endif
-#ifdef __s390x__
+#ifdef __s390__
 #  define LG_QUANTUM		4
 #endif