diff --git a/bench/parser.benchmark.js b/bench/parser.benchmark.js
index c0a61675a..ce295ccd9 100644
--- a/bench/parser.benchmark.js
+++ b/bench/parser.benchmark.js
@@ -16,16 +16,16 @@ const options = {
 };
 
 function createBinaryFrame(length) {
-  const list = Sender.frame(
-    crypto.randomBytes(length),
-    Object.assign({ opcode: 0x02 }, options)
-  );
+  const list = Sender.frame(crypto.randomBytes(length), {
+    opcode: 0x02,
+    ...options
+  });
 
   return Buffer.concat(list);
 }
 
 const pingFrame1 = Buffer.concat(
-  Sender.frame(crypto.randomBytes(5), Object.assign({ opcode: 0x09 }, options))
+  Sender.frame(crypto.randomBytes(5), { opcode: 0x09, ...options })
 );
 
 const textFrame = Buffer.from('819461616161' + '61'.repeat(20), 'hex');
diff --git a/test/receiver.test.js b/test/receiver.test.js
index a2c9ce41d..7d00c76cc 100644
--- a/test/receiver.test.js
+++ b/test/receiver.test.js
@@ -115,16 +115,18 @@ describe('Receiver', () => {
     const options = { rsv1: false, mask: true, readOnly: false };
 
     const frame1 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment1),
-        Object.assign({ fin: false, opcode: 0x01 }, options)
-      )
+      Sender.frame(Buffer.from(fragment1), {
+        fin: false,
+        opcode: 0x01,
+        ...options
+      })
     );
     const frame2 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment2),
-        Object.assign({ fin: true, opcode: 0x00 }, options)
-      )
+      Sender.frame(Buffer.from(fragment2), {
+        fin: true,
+        opcode: 0x00,
+        ...options
+      })
     );
 
     receiver.on('message', (data) => {
@@ -180,22 +182,25 @@ describe('Receiver', () => {
     const options = { rsv1: false, mask: true, readOnly: false };
 
     const frame1 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment1),
-        Object.assign({ fin: false, opcode: 0x01 }, options)
-      )
+      Sender.frame(Buffer.from(fragment1), {
+        fin: false,
+        opcode: 0x01,
+        ...options
+      })
     );
     const frame2 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(pingMessage),
-        Object.assign({ fin: true, opcode: 0x09 }, options)
-      )
+      Sender.frame(Buffer.from(pingMessage), {
+        fin: true,
+        opcode: 0x09,
+        ...options
+      })
     );
     const frame3 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment2),
-        Object.assign({ fin: true, opcode: 0x00 }, options)
-      )
+      Sender.frame(Buffer.from(fragment2), {
+        fin: true,
+        opcode: 0x00,
+        ...options
+      })
     );
 
     let gotPing = false;
@@ -226,22 +231,25 @@ describe('Receiver', () => {
     const options = { rsv1: false, mask: true, readOnly: false };
 
     const frame1 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment1),
-        Object.assign({ fin: false, opcode: 0x01 }, options)
-      )
+      Sender.frame(Buffer.from(fragment1), {
+        fin: false,
+        opcode: 0x01,
+        ...options
+      })
     );
     const frame2 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(pingMessage),
-        Object.assign({ fin: true, opcode: 0x09 }, options)
-      )
+      Sender.frame(Buffer.from(pingMessage), {
+        fin: true,
+        opcode: 0x09,
+        ...options
+      })
     );
     const frame3 = Buffer.concat(
-      Sender.frame(
-        Buffer.from(fragment2),
-        Object.assign({ fin: true, opcode: 0x00 }, options)
-      )
+      Sender.frame(Buffer.from(fragment2), {
+        fin: true,
+        opcode: 0x00,
+        ...options
+      })
     );
 
     let chunks = [];