diff --git a/.travis.yml b/.travis.yml
index c9351a50..cdfa64f8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,7 +51,7 @@ env:
     - PLATFORMIO_CI_SRC=examples/PSBuzz
     # - PLATFORMIO_CI_SRC=examples/testusbhostFAT
     - PLATFORMIO_CI_SRC=examples/USB_desc
-    - PLATFORMIO_CI_SRC=examples/USBH_MIDI/bidrectional_converter
+    - PLATFORMIO_CI_SRC=examples/USBH_MIDI/bidrectional_converter PLATFORMIO_CI_EXTRA_ARGS="-Wno-error -Wno-parentheses"
     - PLATFORMIO_CI_SRC=examples/USBH_MIDI/eVY1_sample
     - PLATFORMIO_CI_SRC=examples/USBH_MIDI/USB_MIDI_converter
     - PLATFORMIO_CI_SRC=examples/USBH_MIDI/USB_MIDI_converter_multi
@@ -74,4 +74,4 @@ install:
     - platformio lib install 62 416 417
 
 script:
-    - platformio ci --board=uno --board=teensy31 --board=due --lib="."
+    - platformio ci --board=uno --board=teensy31 --board=due --lib="." $PLATFORMIO_CI_EXTRA_ARGS
diff --git a/examples/USBH_MIDI/USBH_MIDI_dump/USBH_MIDI_dump.ino b/examples/USBH_MIDI/USBH_MIDI_dump/USBH_MIDI_dump.ino
index 68d3472d..db8faadb 100644
--- a/examples/USBH_MIDI/USBH_MIDI_dump/USBH_MIDI_dump.ino
+++ b/examples/USBH_MIDI/USBH_MIDI_dump/USBH_MIDI_dump.ino
@@ -87,7 +87,7 @@ void doDelay(unsigned long t1, unsigned long t2, unsigned long delayTime)
   unsigned long t3;
 
   if ( t1 > t2 ) {
-    t3 = (4294967295 - t1 + t2);
+    t3 = (0xFFFFFFFF - t1 + t2);
   } else {
     t3 = t2 - t1;
   }