diff --git a/client/bin/multi-client.js b/client/bin/multi-client.js
index 56329e428..88e9b3a7d 100755
--- a/client/bin/multi-client.js
+++ b/client/bin/multi-client.js
@@ -370,6 +370,7 @@ class State {
             case 1: return "1 (error)";         // client/lib/index.js#L401
             case 2: return "2 (test failure)";  // client/lib/index.js#L323
             case 3: return "3 (test error)";    // client/lib/index.js#L328
+			case 4: return "4 (testbot disconnect)";    // client/lib/index.js#L394
             default: return `${c.code} (exception)`; // For all other outcomes
           }
         },
diff --git a/client/lib/index.js b/client/lib/index.js
index fd170e4ff..d0351a75a 100644
--- a/client/lib/index.js
+++ b/client/lib/index.js
@@ -289,6 +289,7 @@ module.exports = class Client extends PassThrough {
 			});
 
 			let capturedError = null;
+			let testDone = false;
 			const wsMessageHandler = ws => async pkg => {
 				try {
 					const { type, data } = JSON.parse(pkg);
@@ -341,6 +342,7 @@ module.exports = class Client extends PassThrough {
 							} else {
 								this.log(`Test suite has exited with: PASS`)
 							}
+							testDone = true;
 							break;
 						case 'error':
 							process.exitCode = 3;
@@ -405,6 +407,11 @@ module.exports = class Client extends PassThrough {
 				ws.on('close', () => {
 					this.log('WS connection is closed');
 					process.stdin.destroy();
+					// give exit code of 4 when WS is closed before tests report as finished
+					if(!testDone){
+						process.exitCode = 4
+					}
+
 					if (capturedError) {
 						reject(capturedError);
 					} else {