diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index fc5619bd4..41b99a95e 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2013-07-09  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* libc/include/sys/config.h (__DYNAMIC_REENT__): Define for RTEMS.
+
 2013-07-09  Bin Cheng  <bin.cheng@arm.com>
 
 	* libc/stdio/fwalk.c (_fwalk): Remove redundant test.
diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
index a641c4b29..c726e14c9 100644
--- a/newlib/libc/include/sys/config.h
+++ b/newlib/libc/include/sys/config.h
@@ -232,6 +232,7 @@
 #if defined(__rtems__)
 #define __FILENAME_MAX__ 255
 #define _READ_WRITE_RETURN_TYPE _ssize_t
+#define __DYNAMIC_REENT__
 #define _REENT_GLOBAL_ATEXIT
 #endif