diff --git a/setup/pi/create-backingfiles.sh b/setup/pi/create-backingfiles.sh
index 80740fd..f7aa695 100644
--- a/setup/pi/create-backingfiles.sh
+++ b/setup/pi/create-backingfiles.sh
@@ -35,7 +35,7 @@ add_drive "cam" "CAM" "$CAM_DISK_SIZE" "$CAM_DISK_FILE_NAME"
 
 if [ "$CAM_PERCENT" -lt 100 ]
 then
-  MUSIC_DISK_SIZE="$(df --output=avail --block-size=1K /backingfiles/ | tail -n 1)"
+  MUSIC_DISK_SIZE="$(df --output=avail --block-size=1K $BACKINGFILES_MOUNTPOINT/ | tail -n 1)"
   MUSIC_DISK_FILE_NAME="$BACKINGFILES_MOUNTPOINT/music_disk.bin"
   add_drive "music" "MUSIC" "$MUSIC_DISK_SIZE" "$MUSIC_DISK_FILE_NAME"
   echo "options g_mass_storage file=$CAM_DISK_FILE_NAME,$MUSIC_DISK_FILE_NAME removable=1,1 ro=0,0 stall=0 iSerialNumber=123456" > "$G_MASS_STORAGE_CONF_FILE_NAME"