diff --git a/lib/libc/stdio/refill.c b/lib/libc/stdio/refill.c
index f0583f75471..c05c5d47d58 100644
--- a/lib/libc/stdio/refill.c
+++ b/lib/libc/stdio/refill.c
@@ -39,7 +39,7 @@
 static char sccsid[] = "@(#)refill.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id$";
+		"$Id: refill.c,v 1.6 1997/02/22 15:02:22 peter Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <errno.h>
@@ -82,6 +82,7 @@ __srefill(fp)
 	if ((fp->_flags & __SRD) == 0) {
 		if ((fp->_flags & __SRW) == 0) {
 			errno = EBADF;
+			fp->_flags |= __SERR;
 			return (EOF);
 		}
 		/* switch to reading */