diff --git a/src/extension/commands/analyzer.ts b/src/extension/commands/analyzer.ts
index 8bd179145..91e370f8e 100644
--- a/src/extension/commands/analyzer.ts
+++ b/src/extension/commands/analyzer.ts
@@ -7,7 +7,7 @@ export class AnalyzerCommands {
 	constructor(context: vs.ExtensionContext, analyzer: Analyzer) {
 		context.subscriptions.push(vs.commands.registerCommand("dart.openAnalyzerDiagnostics", async () => {
 			const res = await analyzer.diagnosticGetServerPort();
-			openInBrowser(`http://localhost:${res.port}/`);
+			openInBrowser(`http://127.0.0.1:${res.port}/`);
 		}));
 	}
 }
diff --git a/src/extension/sdk/dev_tools.ts b/src/extension/sdk/dev_tools.ts
index 1ce1ab86a..0f600284a 100644
--- a/src/extension/sdk/dev_tools.ts
+++ b/src/extension/sdk/dev_tools.ts
@@ -39,7 +39,7 @@ export class DevToolsManager implements vs.Disposable {
 	}
 
 	/// Spawns DevTools and returns the full URL to open for that session
-	///   eg. http://localhost:8123/?port=8543
+	///   eg. http://127.0.0.1:8123/?port=8543
 	public async spawnForSession(session: DartDebugSessionInformation): Promise<{ url: string, dispose: () => void } | undefined> {
 		this.analytics.logDebuggerOpenDevTools();
 
diff --git a/src/test/flutter_web_only/debug/flutter_web.test.ts b/src/test/flutter_web_only/debug/flutter_web.test.ts
index e97814dde..cfad82344 100644
--- a/src/test/flutter_web_only/debug/flutter_web.test.ts
+++ b/src/test/flutter_web_only/debug/flutter_web.test.ts
@@ -37,7 +37,7 @@ describe("flutter for web debugger", () => {
 	it("runs a Flutter web application and remains active until told to quit", async () => {
 		const config = await startDebugger(flutterWebHelloWorldMainFile);
 		await Promise.all([
-			dc.assertOutputContains("stdout", "Serving `web` on http://localhost:"),
+			dc.assertOutputContains("stdout", "Serving `web` on http://127.0.0.1:"),
 			dc.configurationSequence(),
 			dc.launch(config),
 		]);