diff --git a/newlib/libc/sys/rtems/include/sys/param.h b/newlib/libc/sys/rtems/include/sys/param.h
index 1778ec3a8..06ef0ecff 100644
--- a/newlib/libc/sys/rtems/include/sys/param.h
+++ b/newlib/libc/sys/rtems/include/sys/param.h
@@ -99,7 +99,7 @@
  * MCLBYTES must be no larger than PAGE_SIZE.
  */
 #ifndef	MSIZE
-#define	MSIZE		128		/* size of an mbuf */
+#define	MSIZE		256		/* size of an mbuf */
 #endif
 
 #ifndef	MCLSHIFT