diff --git a/debian/files/cloud_init.cfg.tftpl b/debian/files/cloud_init.cfg.tftpl
index 8dfa327..64b701e 100644
--- a/debian/files/cloud_init.cfg.tftpl
+++ b/debian/files/cloud_init.cfg.tftpl
@@ -40,7 +40,7 @@ runcmd:
 - dhclient
 - locale-gen
 
-%{ if data_disk }
+%{ if data_disk != "" }
 device_aliases:
   data: /dev/vdb
 disk_setup:
@@ -55,7 +55,7 @@ fs_setup:
     overwrite: false
 %{ endif }
 
-%{ if data_disk || data_share }
+%{ if data_disk != "" || data_share != "" }
 mounts:
 %{ if data_disk != "" }
 - ["data.1", "/mnt/data"]