diff --git a/src/chromeDebugAdapter.ts b/src/chromeDebugAdapter.ts
index b8c41e3f..41d60dee 100644
--- a/src/chromeDebugAdapter.ts
+++ b/src/chromeDebugAdapter.ts
@@ -187,9 +187,9 @@ export class ChromeDebugAdapter extends CoreDebugAdapter {
     }
 
     public commonArgs(args: ICommonRequestArgs): void {
-        if (!args.webRoot && args.pathMapping && args.pathMapping['/']) {
-            // Adapt pathMapping['/'] as the webRoot when not set, since webRoot is explicitly used in many places
-            args.webRoot = args.pathMapping['/'];
+        if (args.webRoot && (!args.pathMapping || !args.pathMapping['/'])) {
+            args.pathMapping = args.pathMapping || {};
+            args.pathMapping['/'] = args.webRoot;
         }
 
         args.sourceMaps = typeof args.sourceMaps === 'undefined' || args.sourceMaps;
diff --git a/src/chromeDebugInterfaces.d.ts b/src/chromeDebugInterfaces.d.ts
index d98e0fd5..3ed17a90 100644
--- a/src/chromeDebugInterfaces.d.ts
+++ b/src/chromeDebugInterfaces.d.ts
@@ -6,6 +6,7 @@ import * as Core from 'vscode-chrome-debug-core';
 import { DebugProtocol } from 'vscode-debugprotocol';
 
 export interface ICommonRequestArgs extends Core.ICommonRequestArgs {
+    webRoot?: string;
     disableNetworkCache?: boolean;
     urlFilter?: string;
 }
diff --git a/testapp/.vscode/settings.json b/testapp/.vscode/settings.json
index a9fed253..f1719615 100644
--- a/testapp/.vscode/settings.json
+++ b/testapp/.vscode/settings.json
@@ -10,5 +10,7 @@
         "node_modules": true,
         "bin": true,
         "out": true
-    }
+    },
+
+    "tslint.enable": false
 }
\ No newline at end of file