diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 59dd3569c..10e7dabee 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-23  Christopher Faylor  <me.cygwin2012@cgf.cx>
+
+	* libc/stdio/flags.c (__sflags): Guard against using O_BINARY on
+	systems which do not provide it.
+
 2012-08-21  Christopher Faylor  <me.cygwin2012@cgf.cx>
 
 	* libc/stdio/flags.c (__sflags): Rewrite recognition of extended mode
diff --git a/newlib/libc/stdio/flags.c b/newlib/libc/stdio/flags.c
index b2e4d1666..518cc33f1 100644
--- a/newlib/libc/stdio/flags.c
+++ b/newlib/libc/stdio/flags.c
@@ -69,7 +69,9 @@ _DEFUN(__sflags, (ptr, mode, optr),
 	  m = (m & ~O_ACCMODE) | O_RDWR;
 	  break;
 	case 'b':
+#ifdef O_BINARY
 	  m |= O_BINARY;
+#endif
 	  break;
 #ifdef __CYGWIN__
 	case 't':