diff --git a/newlib/libc/include/sys/config.h b/newlib/libc/include/sys/config.h
index e45aa5417..117c49a6d 100644
--- a/newlib/libc/include/sys/config.h
+++ b/newlib/libc/include/sys/config.h
@@ -154,6 +154,7 @@
 #define _REENT_SMALL
 #endif
 
+#define __BUFSIZ__ 256
 #define __SMALL_BITFIELDS
 
 #ifdef __MSP430X_LARGE__