diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
index 4bc8d29bf..b9dff88ff 100644
--- a/newlib/libc/include/sys/config.h
+++ b/newlib/libc/include/sys/config.h
@@ -127,7 +127,7 @@
 #endif
 
 /* Configure small REENT structure for Xilinx MicroBlaze platforms */
-#if defined (__MICROBLAZE__)
+#if defined (__MICROBLAZE__) && !defined(__rtems__)
 #ifndef _REENT_SMALL
 #define _REENT_SMALL
 #endif