diff --git a/keyserver/addons/rust-node-addon/rust-binding-types.js b/keyserver/addons/rust-node-addon/rust-binding-types.js
--- a/keyserver/addons/rust-node-addon/rust-binding-types.js
+++ b/keyserver/addons/rust-node-addon/rust-binding-types.js
@@ -22,6 +22,10 @@
     signedIdentityKeysBlob: SignedIdentityKeysBlob,
   ) => Promise<boolean>,
   +addReservedUsername: (username: string, signature: string) => Promise<void>,
+  +removeReservedUsername: (
+    username: string,
+    signature: string,
+  ) => Promise<void>,
   +TunnelbrokerClient: Class<TunnelbrokerClientClass>,
 };
 
diff --git a/keyserver/addons/rust-node-addon/src/identity_client/mod.rs b/keyserver/addons/rust-node-addon/src/identity_client/mod.rs
--- a/keyserver/addons/rust-node-addon/src/identity_client/mod.rs
+++ b/keyserver/addons/rust-node-addon/src/identity_client/mod.rs
@@ -1,5 +1,6 @@
 pub mod add_reserved_username;
 pub mod register_user;
+pub mod remove_reserved_username;
 pub mod identity_client {
   tonic::include_proto!("identity.client");
 }
@@ -8,6 +9,7 @@
 use identity_client::{
   AddReservedUsernameRequest, DeviceKeyUpload, IdentityKeyInfo,
   RegistrationFinishRequest, RegistrationStartRequest,
+  RemoveReservedUsernameRequest,
 };
 use lazy_static::lazy_static;
 use napi::bindgen_prelude::*;
diff --git a/keyserver/addons/rust-node-addon/src/identity_client/remove_reserved_username.rs b/keyserver/addons/rust-node-addon/src/identity_client/remove_reserved_username.rs
new file mode 100644
--- /dev/null
+++ b/keyserver/addons/rust-node-addon/src/identity_client/remove_reserved_username.rs
@@ -0,0 +1,25 @@
+use super::*;
+
+#[napi]
+#[instrument(skip_all)]
+pub async fn remove_reserved_username(
+  username: String,
+  signature: String,
+) -> Result<()> {
+  // Set up the gRPC client that will be used to talk to the Identity service
+  let channel = get_identity_service_channel().await?;
+  let mut identity_client = IdentityClientServiceClient::new(channel);
+
+  let remove_reserved_username_request = RemoveReservedUsernameRequest {
+    username,
+    signature,
+  };
+
+  identity_client
+    .remove_reserved_username(remove_reserved_username_request)
+    .await
+    .map_err(|_| Error::from_status(Status::GenericFailure))?
+    .into_inner();
+
+  Ok(())
+}