diff --git a/lib/Client.mjs b/lib/Client.mjs
index 5695b1a..afa966e 100644
--- a/lib/Client.mjs
+++ b/lib/Client.mjs
@@ -16,6 +16,9 @@ class Client {
   }
   setBroadcast(flag, cb) {
     if (!cb) cb = () => {};
+    if (typeof flag !== 'boolean') {
+      throw new TypeError('flag must be a boolean');
+    }
     if (this._bound) {
       this._sock.setBroadcast(flag);
       cb();
diff --git a/test/test-client.mjs b/test/test-client.mjs
index dba3b77..872a17a 100644
--- a/test/test-client.mjs
+++ b/test/test-client.mjs
@@ -111,6 +111,18 @@ test('client: setBroadcast', (t) => {
   });
 });
 
+test('client: setBroadcast typeError', (t) => {
+  const client = new Client('127.0.0.1', t.context.port);
+
+  t.plan(1);
+
+  t.throws(() => {
+    client.setBroadcast('Oops');;
+  });
+
+  client.close();
+});
+
 test('client: failure', (t) => {
   const client = new Client('127.0.0.1', t.context.port);