diff --git a/src/auth/mod.rs b/src/auth/mod.rs
index a3e3bfb..627f36c 100644
--- a/src/auth/mod.rs
+++ b/src/auth/mod.rs
@@ -13,7 +13,9 @@ pub struct AuthUserInfo<'a> {
     #[allow(dead_code)]
     authenticator: Authenticator<'a, PasswordConv>,
 
+    #[allow(dead_code)]
     pub username: String,
+
     pub uid: libc::uid_t,
     pub primary_gid: libc::gid_t,
     pub all_gids: Vec<libc::gid_t>,
diff --git a/src/auth/pam.rs b/src/auth/pam.rs
index ed5dc84..0d00294 100644
--- a/src/auth/pam.rs
+++ b/src/auth/pam.rs
@@ -1,3 +1,5 @@
+use std::fmt;
+
 use log::info;
 
 use pam::Authenticator;
@@ -16,15 +18,15 @@ pub enum AuthenticationError {
     SessionOpen,
 }
 
-impl ToString for AuthenticationError {
-    fn to_string(&self) -> String {
+impl fmt::Display for AuthenticationError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            AuthenticationError::PamService(service) => format!("Failed to create authenticator with PAM service '{service}'"),
-            AuthenticationError::AccountValidation => "Invalid login credentials".to_string(),
-            AuthenticationError::HomeDirInvalidUtf8 => "User home directory path contains invalid UTF-8".to_string(),
-            AuthenticationError::ShellInvalidUtf8 => "User shell path contains invalid UTF-8".to_string(),
-            AuthenticationError::UsernameNotFound => "Login creditionals are valid, but username is not found. This should not be possible :(".to_string(),
-            AuthenticationError::SessionOpen => "Failed to open a PAM session".to_string(),
+            Self::PamService(service) => write!(f, "Failed to create authenticator with PAM service '{service}'"),
+            Self::AccountValidation => f.write_str("Invalid login credentials"),
+            Self::HomeDirInvalidUtf8 => f.write_str("User home directory path contains invalid UTF-8"),
+            Self::ShellInvalidUtf8 => f.write_str("User shell path contains invalid UTF-8"),
+            Self::UsernameNotFound => f.write_str("Login creditionals are valid, but username is not found. This should not be possible :("),
+            Self::SessionOpen => f.write_str("Failed to open a PAM session"),
         }
     }
 }
diff --git a/src/chvt.rs b/src/chvt.rs
index 49ed084..359850f 100644
--- a/src/chvt.rs
+++ b/src/chvt.rs
@@ -24,8 +24,8 @@ const KB_84: u8 = 0x01;
 
 #[derive(Debug)]
 pub enum ChvtError {
-    Activate(i32),
-    WaitActive(i32),
+    Activate,
+    WaitActive,
     Close,
     OpenConsole,
     NotAConsole,
@@ -103,12 +103,12 @@ pub unsafe fn chvt(ttynum: i32) -> Result<(), ChvtError> {
 
     let activate = unsafe { libc::ioctl(fd, VT_ACTIVATE, ttynum as c_int) };
     if activate > 0 {
-        return Err(ChvtError::Activate(activate));
+        return Err(ChvtError::Activate);
     }
 
     let wait = unsafe { libc::ioctl(fd, VT_WAITACTIVE, ttynum) };
     if wait > 0 {
-        return Err(ChvtError::WaitActive(wait));
+        return Err(ChvtError::WaitActive);
     }
 
     close(fd).map_err(|_| ChvtError::Close)?;