diff --git a/packages/plugin-ext/package.json b/packages/plugin-ext/package.json
index 1717979ad32aa..fd28b2cb4d541 100644
--- a/packages/plugin-ext/package.json
+++ b/packages/plugin-ext/package.json
@@ -29,6 +29,7 @@
     "getmac": "^1.4.6",
     "jsonc-parser": "^2.0.2",
     "lodash.clonedeep": "^4.5.0",
+    "ps-tree": "^1.2.0",
     "request": "^2.82.0",
     "uuid": "^3.2.1",
     "vscode-debugprotocol": "^1.32.0",
@@ -70,7 +71,8 @@
   "devDependencies": {
     "@theia/ext-scripts": "^0.9.0",
     "@types/decompress": "^4.2.2",
-    "@types/lodash.clonedeep": "^4.5.3"
+    "@types/lodash.clonedeep": "^4.5.3",
+    "@types/ps-tree": "^1.1.0"
   },
   "nyc": {
     "extends": "../../configs/nyc.json"
diff --git a/packages/plugin-ext/src/hosted/node/hosted-plugin-process.ts b/packages/plugin-ext/src/hosted/node/hosted-plugin-process.ts
index 09cce85b15f1b..0978c2de35b27 100644
--- a/packages/plugin-ext/src/hosted/node/hosted-plugin-process.ts
+++ b/packages/plugin-ext/src/hosted/node/hosted-plugin-process.ts
@@ -25,6 +25,7 @@ import { RPCProtocolImpl } from '../../api/rpc-protocol';
 import { MAIN_RPC_CONTEXT } from '../../api/plugin-api';
 import { HostedPluginCliContribution } from './hosted-plugin-cli-contribution';
 import { HostedPluginProcessesCache } from './hosted-plugin-processes-cache';
+import * as psTree from 'ps-tree';
 
 export interface IPCConnectionOptions {
     readonly serverName: string;
@@ -129,9 +130,17 @@ export class HostedPluginProcess implements ServerPluginRunner {
         const hostedPluginManager = rpc.getProxy(MAIN_RPC_CONTEXT.HOSTED_PLUGIN_MANAGER_EXT);
         hostedPluginManager.$stopPlugin('').then(() => {
             emitter.dispose();
-            cp.kill();
+            this.killProcessTree(cp.pid);
         });
+    }
 
+    private killProcessTree(parentPid: number): void {
+        psTree(parentPid, (err: Error, childProcesses: Array<psTree.PS>) => {
+            childProcesses.forEach((p: psTree.PS) => {
+                process.kill(parseInt(p.PID));
+            });
+            process.kill(parentPid);
+        });
     }
 
     public runPluginServer(): void {
diff --git a/yarn.lock b/yarn.lock
index 22fc627496b65..1ca99ed0b71bc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -342,6 +342,11 @@
   dependencies:
     "@types/react" "*"
 
+"@types/ps-tree@^1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@types/ps-tree/-/ps-tree-1.1.0.tgz#7e2034e8ccdc16f6b0ced7a88529ebcb3b1dc424"
+  integrity sha512-rm5GU5sefQpg2d/DQ+fMDZnl9aPiJjJ9FYA12isIocNTZqu9VDZRgCRBx3oYFEdmDpmPmY4hxxmY/+1a84Rtzg==
+
 "@types/range-parser@*":
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.2.tgz#fa8e1ad1d474688a757140c91de6dace6f4abc8d"
@@ -3685,7 +3690,7 @@ etag@~1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
 
-event-stream@~3.3.0:
+event-stream@=3.3.4, event-stream@~3.3.0:
   version "3.3.4"
   resolved "http://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz#4ab4c9a0f5a54db9338b4c34d86bfce8f4b35571"
   dependencies:
@@ -7833,6 +7838,13 @@ ps-tree@1.1.0:
   dependencies:
     event-stream "~3.3.0"
 
+ps-tree@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/ps-tree/-/ps-tree-1.2.0.tgz#5e7425b89508736cdd4f2224d028f7bb3f722ebd"
+  integrity sha512-0VnamPPYHl4uaU/nSFeZZpR21QAWRz+sRv4iW9+v/GS/J5U5iZB5BNN6J0RMoOvdx2gWM2+ZFMIm58q24e4UYA==
+  dependencies:
+    event-stream "=3.3.4"
+
 pseudomap@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"