diff --git a/lib.js b/lib.js
index 4a9cc2c..d6b8e26 100644
--- a/lib.js
+++ b/lib.js
@@ -109,13 +109,13 @@ function request(options, data = "") {
     });
 
     req.on("socket", (socket) => {
-      socket.on("lookup", () => {
+      socket.once("lookup", () => {
         dnsLookup = performance.now();
       });
-      socket.on("connect", () => {
+      socket.once("connect", () => {
         tcpHandshake = performance.now();
       });
-      socket.on("secureConnect", () => {
+      socket.once("secureConnect", () => {
         sslHandshake = performance.now();
       });
     });
diff --git a/test/cli.test.js b/test/cli.test.js
index 51a1cbe..d7f20a3 100644
--- a/test/cli.test.js
+++ b/test/cli.test.js
@@ -157,7 +157,7 @@ describe('Speed Test CLI', () => {
         on: jest.fn((event, callback) => {
           if (event === 'socket') {
             const mockSocket = {
-              on: jest.fn((socketEvent, socketCallback) => {
+              once: jest.fn((socketEvent, socketCallback) => {
                 if (socketEvent === 'lookup') setTimeout(() => socketCallback(), 1);
                 if (socketEvent === 'connect') setTimeout(() => socketCallback(), 2);
                 if (socketEvent === 'secureConnect') setTimeout(() => socketCallback(), 3);
@@ -206,7 +206,7 @@ describe('Speed Test CLI', () => {
         on: jest.fn((event, callback) => {
           if (event === 'socket') {
             const mockSocket = {
-              on: jest.fn((socketEvent, socketCallback) => {
+              once: jest.fn((socketEvent, socketCallback) => {
                 if (socketEvent === 'lookup') setTimeout(() => socketCallback(), 1);
                 if (socketEvent === 'connect') setTimeout(() => socketCallback(), 2);
                 if (socketEvent === 'secureConnect') setTimeout(() => socketCallback(), 3);
@@ -255,7 +255,7 @@ describe('Speed Test CLI', () => {
         on: jest.fn((event, callback) => {
           if (event === 'socket') {
             const mockSocket = {
-              on: jest.fn((socketEvent, socketCallback) => {
+              once: jest.fn((socketEvent, socketCallback) => {
                 if (socketEvent === 'lookup') setTimeout(() => socketCallback(), 1);
                 if (socketEvent === 'connect') setTimeout(() => socketCallback(), 2);
                 if (socketEvent === 'secureConnect') setTimeout(() => socketCallback(), 3);