diff --git a/ChangeLog.txt b/ChangeLog.txt
index da18d86e8..d5784608e 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1560,4 +1560,8 @@
 	  (2016-02-23).
 	* apps/platform/sabre-6quad:  Add a platform directory for the
 	  Sabre 6Quad board (2016-03-01).
-	* apps/examples/ostest:  Add a test of TLS (2016-03-11).
\ No newline at end of file
+	* apps/examples/ostest:  Add a test of TLS (2016-03-11).
+	* apps/modbus/nuttx/portserial.c:  Was not returning an error
+	  on failure to open the device driver.  From Olololshka kokoko
+	  (2016-03-16).
+
diff --git a/modbus/nuttx/portserial.c b/modbus/nuttx/portserial.c
index 41ec19eeb..fcf3d088e 100644
--- a/modbus/nuttx/portserial.c
+++ b/modbus/nuttx/portserial.c
@@ -220,6 +220,7 @@ bool xMBPortSerialInit(uint8_t ucPort, speed_t ulBaudRate,
     {
       vMBPortLog(MB_LOG_ERROR, "SER-INIT", "Can't open serial port %s: %d\n",
                  szDevice, errno);
+      bStatus = false;
     }
 
 #ifdef CONFIG_SERIAL_TERMIOS