diff --git a/rust/pv/src/crypto.rs b/rust/pv/src/crypto.rs
index 65b4f994..d4442a06 100644
--- a/rust/pv/src/crypto.rs
+++ b/rust/pv/src/crypto.rs
@@ -119,6 +119,7 @@ impl SymKeyType {
     }
 
     /// Returns true if the [`SymKeyType`] is an AEAD key
+    #[must_use]
     pub const fn is_aead(&self) -> bool {
         self.tag_len().is_some()
     }
diff --git a/rust/pv/src/req/keyslot.rs b/rust/pv/src/req/keyslot.rs
index b8415fac..633e1e4f 100644
--- a/rust/pv/src/req/keyslot.rs
+++ b/rust/pv/src/req/keyslot.rs
@@ -182,6 +182,7 @@ impl Keyslot {
     }
 
     /// Return the public host key hash size for the given version of the key-slot in bytes
+    #[must_use]
     pub fn phkh_size(&self) -> u32 {
         match self {
             Keyslot::V1(_) => KeyslotV1::PHKH_SIZE,
@@ -190,6 +191,7 @@ impl Keyslot {
     }
 
     /// Return the size of the key-slot in bytes
+    #[must_use]
     pub fn size(&self) -> usize {
         match self {
             Keyslot::V1(_) => KeyslotV1::SIZE,