diff --git a/c/src/lib/libbsp/i386/pc386/dec21140/dec21140.c b/c/src/lib/libbsp/i386/pc386/dec21140/dec21140.c
index 221cd0da26..3156bbd937 100644
--- a/c/src/lib/libbsp/i386/pc386/dec21140/dec21140.c
+++ b/c/src/lib/libbsp/i386/pc386/dec21140/dec21140.c
@@ -105,7 +105,7 @@ struct MD {
 /*
  * Receive buffer size -- Allow for a full ethernet packet including CRC
  */
-#define RBUF_SIZE	1520
+#define RBUF_SIZE	1536
 
 #define	ET_MINLEN 60		/* minimum message length */