Index: uspace/app/tester/chardev/chardev1.c
===================================================================
--- uspace/app/tester/chardev/chardev1.c	(revision 3b3fcf369f7972634c32240f6c2c7e342deadefe)
+++ uspace/app/tester/chardev/chardev1.c	(revision 063a364794dc48510948ecc3cf9196cd0a7cee9e)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2017 Jiri Svoboda
+ * Copyright (c) 2019 Jiri Svoboda
  * All rights reserved.
  *
@@ -76,5 +76,6 @@
 	TPRINTF("Sent %zu bytes\n", nbytes);
 
-	rc = chardev_read(chardev, small_buffer, SMALL_BUFFER_SIZE, &nbytes);
+	rc = chardev_read(chardev, small_buffer, SMALL_BUFFER_SIZE, &nbytes,
+	    chardev_f_none);
 	if (rc != EOK) {
 		chardev_close(chardev);
@@ -128,5 +129,6 @@
 	TPRINTF("Sent %zu bytes\n", nbytes);
 
-	rc = chardev_read(chardev, large_buffer, LARGE_BUFFER_SIZE, &nbytes);
+	rc = chardev_read(chardev, large_buffer, LARGE_BUFFER_SIZE, &nbytes,
+	    chardev_f_none);
 	if (rc != EOK) {
 		chardev_close(chardev);
@@ -181,5 +183,6 @@
 	    str_error_name(rc));
 
-	rc = chardev_read(chardev, small_buffer, SMALL_BUFFER_SIZE, &nbytes);
+	rc = chardev_read(chardev, small_buffer, SMALL_BUFFER_SIZE, &nbytes,
+	    chardev_f_none);
 	if (rc != EIO || nbytes != 1) {
 		chardev_close(chardev);
Index: uspace/app/tester/hw/serial/serial1.c
===================================================================
--- uspace/app/tester/hw/serial/serial1.c	(revision 3b3fcf369f7972634c32240f6c2c7e342deadefe)
+++ uspace/app/tester/hw/serial/serial1.c	(revision 063a364794dc48510948ecc3cf9196cd0a7cee9e)
@@ -136,5 +136,6 @@
 	while (total < cnt) {
 
-		rc = chardev_read(chardev, buf, cnt - total, &nread);
+		rc = chardev_read(chardev, buf, cnt - total, &nread,
+		    chardev_f_none);
 		if (rc != EOK) {
 			(void) serial_set_comm_props(serial, old_baud,