diff --git a/src/olm/messages/pre_key.rs b/src/olm/messages/pre_key.rs
index ce659b30..5a89ebba 100644
--- a/src/olm/messages/pre_key.rs
+++ b/src/olm/messages/pre_key.rs
@@ -153,7 +153,7 @@ impl PreKeyMessage {
 
     /// Create a new pre-key message from the session keys and standard message.
     #[cfg(feature = "low-level-api")]
-    pub fn wrap(session_keys: SessionKeys, message: Message) -> Self {
+    pub const fn wrap(session_keys: SessionKeys, message: Message) -> Self {
         PreKeyMessage::new(session_keys, message)
     }
 
diff --git a/src/olm/session/message_key.rs b/src/olm/session/message_key.rs
index 602610a3..1c690e50 100644
--- a/src/olm/session/message_key.rs
+++ b/src/olm/session/message_key.rs
@@ -95,13 +95,13 @@ impl MessageKey {
 
     /// Get the message key's ratchet key.
     #[cfg(feature = "low-level-api")]
-    pub fn ratchet_key(&self) -> RatchetPublicKey {
+    pub const fn ratchet_key(&self) -> RatchetPublicKey {
         self.ratchet_key
     }
 
     /// Get the message key's index.
     #[cfg(feature = "low-level-api")]
-    pub fn index(&self) -> u64 {
+    pub const fn index(&self) -> u64 {
         self.index
     }
 }