diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index f33a2fef4..29ace2ac9 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2010-11-16  Ralf Corsépius  <ralf.corsepius@rtems.org>
+
+	* configure.host: Add -D_COMPILING_NEWLIB to newlib_cflags.
+
 2010-11-04  Ralf Corsépius  <ralf.corsepius@rtems.org>
 
 	* libm/complex/cacos.c: Reorder function calls to work around ICE
diff --git a/newlib/configure.host b/newlib/configure.host
index 001a6bc56..1ea6940dd 100644
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -558,6 +558,7 @@ case "${host}" in
   *-*-rtems*)
 	default_newlib_io_long_long="yes"
 	default_newlib_io_c99_formats="yes"
+	newlib_cflags="${newlib_cflags} -D_COMPILING_NEWLIB"
 	newlib_cflags="${newlib_cflags} -DMALLOC_PROVIDED -DEXIT_PROVIDED -DSIGNAL_PROVIDED -DREENTRANT_SYSCALLS_PROVIDED -DHAVE_NANOSLEEP -DHAVE_BLKSIZE -DHAVE_FCNTL -DHAVE_ASSERT_FUNC"
         # turn off unsupported items in posix directory 
 	newlib_cflags="${newlib_cflags} -D_NO_GETLOGIN -D_NO_GETPWENT -D_NO_GETUT -D_NO_GETPASS -D_NO_SIGSET -D_NO_WORDEXP -D_NO_POPEN"