diff --git a/x-pack/plugins/code/server/lsp/proxy.ts b/x-pack/plugins/code/server/lsp/proxy.ts
index 23703cd4df8ae..33c80c0727a98 100644
--- a/x-pack/plugins/code/server/lsp/proxy.ts
+++ b/x-pack/plugins/code/server/lsp/proxy.ts
@@ -5,13 +5,13 @@
  */
 import EventEmitter from 'events';
 import * as net from 'net';
+import { fileURLToPath } from 'url';
 import {
   createMessageConnection,
   MessageConnection,
   SocketMessageReader,
   SocketMessageWriter,
 } from 'vscode-jsonrpc';
-
 import { RequestMessage, ResponseMessage } from 'vscode-jsonrpc/lib/messages';
 
 import {
@@ -111,6 +111,7 @@ export class LanguageServerProxy implements ILanguageServerHandler {
       workspaceFolders,
       rootUri,
       capabilities: clientCapabilities,
+      rootPath: fileURLToPath(rootUri),
     };
     return await clientConn
       .sendRequest(
diff --git a/x-pack/plugins/code/server/lsp/request_expander.test.ts b/x-pack/plugins/code/server/lsp/request_expander.test.ts
index 3617e20c83679..96fdfeddc9866 100644
--- a/x-pack/plugins/code/server/lsp/request_expander.test.ts
+++ b/x-pack/plugins/code/server/lsp/request_expander.test.ts
@@ -8,6 +8,8 @@ import fs from 'fs';
 import mkdirp from 'mkdirp';
 import rimraf from 'rimraf';
 import sinon from 'sinon';
+import { pathToFileURL } from 'url';
+
 import { ServerOptions } from '../server_options';
 import { LanguageServerProxy } from './proxy';
 import { InitializingError, RequestExpander } from './request_expander';
@@ -108,6 +110,7 @@ test('be able to open multiple workspace', async () => {
     params: [],
     workspacePath: '/tmp/test/workspace/1',
   };
+
   const request2 = {
     method: 'request2',
     params: [],
@@ -122,7 +125,7 @@ test('be able to open multiple workspace', async () => {
     proxyStub.initialize.calledOnceWith({}, [
       {
         name: request1.workspacePath,
-        uri: `file://${request1.workspacePath}`,
+        uri: pathToFileURL(request1.workspacePath).href,
       },
     ])
   ).toBeTruthy();
@@ -134,7 +137,7 @@ test('be able to open multiple workspace', async () => {
           added: [
             {
               name: request2.workspacePath,
-              uri: `file://${request2.workspacePath}`,
+              uri: pathToFileURL(request2.workspacePath).href,
             },
           ],
           removed: [],
@@ -178,13 +181,13 @@ test('be able to swap workspace', async () => {
           added: [
             {
               name: request2.workspacePath,
-              uri: `file://${request2.workspacePath}`,
+              uri: pathToFileURL(request2.workspacePath).href,
             },
           ],
           removed: [
             {
               name: request1.workspacePath,
-              uri: `file://${request1.workspacePath}`,
+              uri: pathToFileURL(request1.workspacePath).href,
             },
           ],
         },
diff --git a/x-pack/plugins/code/server/lsp/request_expander.ts b/x-pack/plugins/code/server/lsp/request_expander.ts
index 6545f8e784285..4b3c3833785e8 100644
--- a/x-pack/plugins/code/server/lsp/request_expander.ts
+++ b/x-pack/plugins/code/server/lsp/request_expander.ts
@@ -6,8 +6,11 @@
 
 import fs from 'fs';
 import path from 'path';
+import { pathToFileURL } from 'url';
+
 import { ResponseError, ResponseMessage } from 'vscode-jsonrpc/lib/messages';
 import { DidChangeWorkspaceFoldersParams, InitializeResult } from 'vscode-languageserver-protocol';
+
 import { ServerNotInitialized } from '../../common/lsp_error_codes';
 import { LspRequest } from '../../model';
 import { ServerOptions } from '../server_options';
@@ -93,7 +96,7 @@ export class RequestExpander implements ILanguageServerHandler {
             removed: [
               {
                 name: workspacePath!,
-                uri: `file://${workspacePath}`,
+                uri: pathToFileURL(workspacePath).href,
               },
             ],
             added: [],
@@ -148,7 +151,7 @@ export class RequestExpander implements ILanguageServerHandler {
       [
         {
           name: workspacePath,
-          uri: `file://${workspacePath}`,
+          uri: pathToFileURL(workspacePath).href,
         },
       ],
       this.initialOptions
@@ -227,7 +230,7 @@ export class RequestExpander implements ILanguageServerHandler {
         added: [
           {
             name: workspacePath!,
-            uri: `file://${workspacePath}`,
+            uri: pathToFileURL(workspacePath).href,
           },
         ],
         removed: [],
@@ -247,7 +250,7 @@ export class RequestExpander implements ILanguageServerHandler {
       if (oldestWorkspace) {
         params.event.removed.push({
           name: oldestWorkspace,
-          uri: `file://${oldestWorkspace}`,
+          uri: pathToFileURL(oldestWorkspace).href,
         });
         this.removeWorkspace(oldestWorkspace);
       }