diff --git a/openpgp-card-sequoia/src/card.rs b/openpgp-card-sequoia/src/card.rs
index 66bf735..3b2879f 100644
--- a/openpgp-card-sequoia/src/card.rs
+++ b/openpgp-card-sequoia/src/card.rs
@@ -395,12 +395,12 @@ impl Admin<'_, '_> {
         }
     }
 
-    pub fn set_resetting_code(&mut self, pin: &str) -> Result<(), Error> {
-        self.oc.opt.set_resetting_code(pin.as_bytes())
+    pub fn set_resetting_code(&mut self, pin: &[u8]) -> Result<(), Error> {
+        self.oc.opt.set_resetting_code(pin)
     }
 
-    pub fn reset_user_pin(&mut self, new: &str) -> Result<(), Error> {
-        self.oc.opt.reset_retry_counter_pw1(new.as_bytes(), None)
+    pub fn reset_user_pin(&mut self, new: &[u8]) -> Result<(), Error> {
+        self.oc.opt.reset_retry_counter_pw1(new, None)
     }
 
     /// Upload a ValidErasedKeyAmalgamation to the card as a specific KeyType.
diff --git a/tools/src/bin/opgpcard-pin/main.rs b/tools/src/bin/opgpcard-pin/main.rs
index cf90e06..b2f31b4 100644
--- a/tools/src/bin/opgpcard-pin/main.rs
+++ b/tools/src/bin/opgpcard-pin/main.rs
@@ -114,7 +114,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     rpassword::read_password_from_tty(Some("Repeat the new resetting code: "))?;
 
                 if newpin1 == newpin2 {
-                    admin.set_resetting_code(&newpin1)?;
+                    admin.set_resetting_code(newpin1.as_bytes())?;
                 } else {
                     return Err(anyhow::anyhow!("PINs do not match.").into());
                 }
@@ -162,7 +162,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 // reset to new user pin
                 open.reset_user_pin(rst.as_bytes(), newpin1.as_bytes())
             } else if let Some(mut admin) = open.admin_card() {
-                admin.reset_user_pin(&newpin1)
+                admin.reset_user_pin(newpin1.as_bytes())
             } else {
                 return Err(anyhow::anyhow!("Failed to use card in admin-mode.").into());
             };