diff --git a/SD_ROOT/wz_mini/bin/upgrade-run.sh b/SD_ROOT/wz_mini/bin/upgrade-run.sh
index 5c4b237..297af25 100755
--- a/SD_ROOT/wz_mini/bin/upgrade-run.sh
+++ b/SD_ROOT/wz_mini/bin/upgrade-run.sh
@@ -50,6 +50,7 @@ echo "Launching latest upgrade-script"
 /opt/wz_mini/bin/upgrade-run.sh backup_begin &
 
 echo "Exit old script"
+rm -f /dev/fd
 exit 0
 }