diff --git a/src/usb_moded-android.c b/src/usb_moded-android.c
index 5775a7e..30590e9 100644
--- a/src/usb_moded-android.c
+++ b/src/usb_moded-android.c
@@ -89,9 +89,9 @@ int set_android_charging_mode(void)
 {
    int ret = 0;
 
-   /* disable, set functions to "null", re-enable */
+   /* disable, set functions to "mass_storage", re-enable */
    write_to_file("/sys/class/android_usb/android0/enable", "0");
-   write_to_file("/sys/class/android_usb/android0/functions", "null");
+   write_to_file("/sys/class/android_usb/android0/functions", "mass_storage");
    ret = write_to_file("/sys/class/android_usb/android0/enable", "1");
    if(ret < 0)
 	return(1);