diff --git a/src/bin/punchnet/api/mod.rs b/src/bin/punchnet/api/mod.rs
index 3de82da..87a1d29 100644
--- a/src/bin/punchnet/api/mod.rs
+++ b/src/bin/punchnet/api/mod.rs
@@ -39,8 +39,9 @@ fn do_calculate(data: &[u8]) -> Result<String>{
 
 impl <'a> HMacCalculator for TokenLoginData<'a> {
     fn calculate_hmac(&self) -> Result<String> {
-        let data = format!("client_id={}&mac={}&system={}&token={}&version={}",
+        let data = format!("client_id={}&hostname={}&mac={}&system={}&token={}&version={}",
             self.client_id,
+            self.hostname,
             self.mac,
             self.system,
             self.token,
@@ -64,8 +65,9 @@ struct UserPassLoginData<'a> {
 
 impl HMacCalculator for UserPassLoginData<'_> {
     fn calculate_hmac(&self) -> Result<String> {
-        let data = format!("client_id={}&mac={}&password={}&system={}&username={}&version={}",
+        let data = format!("client_id={}&hostname={}&mac={}&password={}&system={}&username={}&version={}",
             self.client_id,
+            self.hostname,
             self.mac,
             self.password,
             self.system,