diff --git a/include/boost/detail/limits.hpp b/include/boost/detail/limits.hpp
index 03524403..02bf2633 100644
--- a/include/boost/detail/limits.hpp
+++ b/include/boost/detail/limits.hpp
@@ -49,7 +49,7 @@
 
 // The macros are not named appropriately.  We don't care about integer
 // bit layout, but about floating-point NaN (etc.) bit patterns.
-#if defined(__sparc) || defined(__sparc__) || defined(__powerpc__) || defined(__ppc__) || defined(__hppa) || defined(_MIPSEB) || defined(_POWER)
+#if defined(__sparc) || defined(__sparc__) || defined(__powerpc__) || defined(__ppc__) || defined(__hppa) || defined(_MIPSEB) || defined(_POWER) || defined(__s390__)
 #define BOOST_BIG_ENDIAN
 #elif defined(__i386__) || defined(__alpha__) || defined(__ia64) || defined(__ia64__)
 #define BOOST_LITTLE_ENDIAN