diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/OlmMachine.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/OlmMachine.kt
index 04a51c723c..ddd7cc4134 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/OlmMachine.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/OlmMachine.kt
@@ -632,6 +632,12 @@ internal class OlmMachine(
         return plainDevices
     }
 
+    @Throws(CryptoStoreErrorException::class)
+    internal suspend fun markDeviceAsTrusted(userId: String, deviceId: String) =
+        withContext(Dispatchers.IO) {
+            inner.markDeviceAsTrusted(userId, deviceId)
+        }
+
     /** Update all of our live device listeners. */
     private suspend fun updateLiveDevices() {
         for ((liveDevice, users) in deviceUpdateObserver.listeners) {
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/RustVerificationService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/RustVerificationService.kt
index b326639de7..26d9fd1ef6 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/RustVerificationService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/RustVerificationService.kt
@@ -102,18 +102,7 @@ constructor(
     }
 
     override fun markedLocallyAsManuallyVerified(userId: String, deviceID: String) {
-        TODO()
-        // setDeviceVerificationAction.handle(DeviceTrustLevel(false, true),
-        //         userId,
-        //         deviceID)
-
-        // listeners.forEach {
-        //     try {
-        //         it.markedAsManuallyVerified(userId, deviceID)
-        //     } catch (e: Throwable) {
-        //         Timber.e(e, "## Error while notifying listeners")
-        //     }
-        // }
+        runBlocking { olmMachine.markDeviceAsTrusted(userId, deviceID) }
     }
 
     fun onEvent(event: Event) = when (event.getClearType()) {
diff --git a/rust-sdk/src/lib.rs b/rust-sdk/src/lib.rs
index e21591d976..331c6336b2 100644
--- a/rust-sdk/src/lib.rs
+++ b/rust-sdk/src/lib.rs
@@ -7,7 +7,9 @@ mod responses;
 pub use device::Device;
 pub use error::{CryptoStoreError, DecryptionError, KeyImportError, MachineCreationError};
 pub use logger::{set_logger, Logger};
-pub use machine::{KeyRequestPair, OlmMachine, Sas, StartSasResult, VerificationRequest, QrCode, Verification};
+pub use machine::{
+    KeyRequestPair, OlmMachine, QrCode, Sas, StartSasResult, Verification, VerificationRequest,
+};
 pub use responses::{
     DeviceLists, KeysImportResult, OutgoingVerificationRequest, Request, RequestType,
 };
diff --git a/rust-sdk/src/machine.rs b/rust-sdk/src/machine.rs
index aa2b581e07..bbce67d9a7 100644
--- a/rust-sdk/src/machine.rs
+++ b/rust-sdk/src/machine.rs
@@ -4,8 +4,8 @@ use std::{
     io::Cursor,
 };
 
-use js_int::UInt;
 use base64::encode;
+use js_int::UInt;
 use ruma::{
     api::{
         client::r0::{
@@ -30,9 +30,9 @@ use tokio::runtime::Runtime;
 
 use matrix_sdk_common::{deserialized_responses::AlgorithmInfo, uuid::Uuid};
 use matrix_sdk_crypto::{
-    decrypt_key_export, encrypt_key_export, EncryptionSettings, OlmMachine as InnerMachine,
-    QrVerification as InnerQr, Sas as InnerSas, Verification as RustVerification,
-    VerificationRequest as InnerVerificationRequest,
+    decrypt_key_export, encrypt_key_export, EncryptionSettings, LocalTrust,
+    OlmMachine as InnerMachine, QrVerification as InnerQr, Sas as InnerSas,
+    Verification as RustVerification, VerificationRequest as InnerVerificationRequest,
 };
 
 use crate::{
@@ -227,6 +227,25 @@ impl OlmMachine {
             .map(|d| d.into()))
     }
 
+    pub fn mark_device_as_trusted(
+        &self,
+        user_id: &str,
+        device_id: &str,
+    ) -> Result<(), CryptoStoreError> {
+        let user_id = UserId::try_from(user_id)?;
+
+        let device = self
+            .runtime
+            .block_on(self.inner.get_device(&user_id, device_id.into()))?;
+
+        if let Some(device) = device {
+            self.runtime
+                .block_on(device.set_local_trust(LocalTrust::Verified))?;
+        }
+
+        Ok(())
+    }
+
     /// Get all devices of an user.
     ///
     /// # Arguments
@@ -731,7 +750,10 @@ impl OlmMachine {
         let user_id = UserId::try_from(user_id).ok()?;
         self.inner
             .get_verification(&user_id, flow_id)
-            .and_then(|v| v.qr_v1().and_then(|qr| qr.to_bytes().map(|b| encode(b)).ok()))
+            .and_then(|v| {
+                v.qr_v1()
+                    .and_then(|qr| qr.to_bytes().map(|b| encode(b)).ok())
+            })
     }
 
     pub fn start_sas_verification(
diff --git a/rust-sdk/src/olm.udl b/rust-sdk/src/olm.udl
index 9b488d6962..2acb35bb23 100644
--- a/rust-sdk/src/olm.udl
+++ b/rust-sdk/src/olm.udl
@@ -177,6 +177,8 @@ interface OlmMachine {
     [Throws=CryptoStoreError]
     Device? get_device([ByRef] string user_id, [ByRef] string device_id);
     [Throws=CryptoStoreError]
+    void mark_device_as_trusted([ByRef] string user_id, [ByRef] string device_id);
+    [Throws=CryptoStoreError]
     sequence<Device> get_user_devices([ByRef] string user_id);
 
     void update_tracked_users(sequence<string> users);