diff --git a/src/config/options_test.rs b/src/config/options_test.rs
index 790a14e..6b91235 100644
--- a/src/config/options_test.rs
+++ b/src/config/options_test.rs
@@ -10,10 +10,6 @@ use crate::config::*;
 
 fn minimal_valid_options() -> HashMap<String, String> {
   let mut opts = HashMap::new();
-  opts.insert(
-    "DIPLONAT_PRIVATE_IP".to_string(),
-    "172.123.43.555".to_string(),
-  );
   opts.insert(
     "DIPLONAT_CONSUL_NODE_NAME".to_string(),
     "consul_node".to_string(),
@@ -24,6 +20,10 @@ fn minimal_valid_options() -> HashMap<String, String> {
 fn all_valid_options() -> HashMap<String, String> {
   let mut opts = minimal_valid_options();
   opts.insert("DIPLONAT_EXPIRATION_TIME".to_string(), "30".to_string());
+  opts.insert(
+    "DIPLONAT_PRIVATE_IP".to_string(),
+    "172.123.43.555".to_string(),
+  );
   opts.insert("DIPLONAT_REFRESH_TIME".to_string(), "10".to_string());
   opts.insert(
     "DIPLONAT_CONSUL_URL".to_string(),
@@ -40,7 +40,6 @@ fn all_valid_options() -> HashMap<String, String> {
 #[test]
 #[should_panic]
 fn err_empty_env() {
-  std::env::remove_var("DIPLONAT_PRIVATE_IP");
   std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
   ConfigOpts::from_env().unwrap();
 }
@@ -60,10 +59,7 @@ fn ok_from_iter_minimal_valid_options() {
     rt_config.firewall.refresh_time,
     Duration::from_secs(REFRESH_TIME.into())
   );
-  assert_eq!(
-    &rt_config.igd.private_ip,
-    opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
-  );
+  assert!(rt_config.igd.private_ip.is_none());
   assert_eq!(
     rt_config.igd.expiration_time,
     Duration::from_secs(EXPIRATION_TIME.into())
@@ -120,7 +116,7 @@ fn ok_from_iter_all_valid_options() {
   );
   assert_eq!(rt_config.firewall.refresh_time, refresh_time);
   assert_eq!(
-    &rt_config.igd.private_ip,
+    &rt_config.igd.private_ip.unwrap(),
     opts.get(&"DIPLONAT_PRIVATE_IP".to_string()).unwrap()
   );
   assert_eq!(rt_config.igd.expiration_time, expiration_time);