diff --git a/files/network_config.cfg.tftpl b/files/network_config.cfg.tftpl
index 930e15d..da73517 100644
--- a/files/network_config.cfg.tftpl
+++ b/files/network_config.cfg.tftpl
@@ -1,7 +1,7 @@
 version: 2
 ethernets:
   ens3:
-%{ if fixed_address }
+%{ if fixed_address != "" }
     dhcp4: false
     addresses:
       - "${fixed_address}"
diff --git a/variables.tf b/variables.tf
index d728190..3a582a9 100644
--- a/variables.tf
+++ b/variables.tf
@@ -62,5 +62,5 @@ variable "data_disk" {
 
 variable "fixed_address" {
   type    = string
-  default = null
+  default = ""
 }