diff --git a/libdevs.c b/libdevs.c
index 39e7072..bb47fb6 100644
--- a/libdevs.c
+++ b/libdevs.c
@@ -415,7 +415,7 @@ static int read_all(int fd, char *buf, size_t count)
 		if (rc < 0) {
 			if (errno == EINTR)
 				continue;
-			assert(errno == EIO);
+			assert(errno == EIO || errno == ENODATA);
 			return - errno;
 		}
 		assert(rc != 0); /* We should never hit the end of the file. */