diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 581a3330fcf..c8674e59dda 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2008-07-31  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* config/i386/darwin.h (MAIN_STACK_BOUNDARY): Define to 128.
+
 2008-07-31  Steve Ellcey  <sje@cup.hp.com>
 
 	* expr.c (expand_assignment): Check for complete type.
diff --git a/gcc/config/i386/darwin.h b/gcc/config/i386/darwin.h
index c6ed10d8a72..a1defcf9bc6 100644
--- a/gcc/config/i386/darwin.h
+++ b/gcc/config/i386/darwin.h
@@ -75,6 +75,9 @@ along with GCC; see the file COPYING3.  If not see
 #undef STACK_BOUNDARY
 #define STACK_BOUNDARY 128
 
+#undef MAIN_STACK_BOUNDARY
+#define MAIN_STACK_BOUNDARY 128
+
 /* Since we'll never want a stack boundary less aligned than 128 bits
    we need the extra work here otherwise bits of gcc get very grumpy
    when we ask for lower alignment.  We could just reject values less