diff --git a/scripts/qcow2_handling b/scripts/qcow2_handling
index 0d8e4e7..0b13860 100644
--- a/scripts/qcow2_handling
+++ b/scripts/qcow2_handling
@@ -3,6 +3,9 @@
 export CURRENT_IMAGE
 export CURRENT_MOUNTPOINT
 
+export NBD_DEV
+export MAP_DEV
+
 # set in build.sh
 # should be fairly enough for the beginning
 # overwrite here by uncommenting following lines