diff --git a/tools/xen/build_domU.sh b/tools/xen/build_domU.sh
index 24209c5351..e91108ba36 100755
--- a/tools/xen/build_domU.sh
+++ b/tools/xen/build_domU.sh
@@ -35,7 +35,7 @@ MGT_BR=${MGT_BR:-xapi2}
 MGT_VLAN=${MGT_VLAN:-101}
 
 # VM Password
-PASSWORD=${PASSWORD:-secrete}
+GUEST_PASSWORD=${GUEST_PASSWORD:-secrete}
 
 # Size of image
 VDI_MB=${VDI_MB:-2500}