diff --git a/board/miyoo/main/apps/usb-hid/usb-hid.py b/board/miyoo/main/apps/usb-hid/usb-hid.py
index 8ab4591c..99b1541c 100755
--- a/board/miyoo/main/apps/usb-hid/usb-hid.py
+++ b/board/miyoo/main/apps/usb-hid/usb-hid.py
@@ -60,7 +60,7 @@ def write_pressed_keys(e):
         return
 
     keys =''.join(chr(key) for key in all_keys)            
-    write_report(chr(special_keys)+NULL_CHAR+keys+NULL_CHAR*5)
+    write_report(chr(special_keys)+NULL_CHAR+keys+NULL_CHAR*(6 - len(all_keys)))
     
     
 print("Press RESET button to quit")