diff --git a/src/helper/system.h b/src/helper/system.h
index 07b0cb9f2..169df1cb4 100644
--- a/src/helper/system.h
+++ b/src/helper/system.h
@@ -59,6 +59,14 @@
 #ifdef HAVE_SYS_POLL_H
 #include <sys/poll.h>
 #endif
+
+#ifdef __ECOS
+/* missing from eCos */
+#ifndef EFAULT
+#define	EFAULT 14	/* Bad address */
+#endif
+#endif
+
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif