diff --git a/src/stdio/__stdio_read.c b/src/stdio/__stdio_read.c
index f8fa6d3bf381bd5356e0f3c7bac33286f828ea25..af50508c2e8a71df12f4428e4ec4f2bf65cae0b3 100644
--- a/src/stdio/__stdio_read.c
+++ b/src/stdio/__stdio_read.c
@@ -11,7 +11,7 @@ size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
 
 	cnt = syscall(SYS_readv, f->fd, iov, 2);
 	if (cnt <= 0) {
-		f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
+		f->flags |= cnt ? F_ERR : F_EOF;
 		return cnt;
 	}
 	if (cnt <= iov[0].iov_len) return cnt;