diff --git a/src/vs/workbench/api/electron-browser/mainThreadExtensionService.ts b/src/vs/workbench/api/electron-browser/mainThreadExtensionService.ts
index 39ebe4816f4..c0795441bb0 100644
--- a/src/vs/workbench/api/electron-browser/mainThreadExtensionService.ts
+++ b/src/vs/workbench/api/electron-browser/mainThreadExtensionService.ts
@@ -44,9 +44,6 @@ export class MainThreadExtensionService implements MainThreadExtensionServiceSha
 	public dispose(): void {
 	}
 
-	$localShowMessage(severity: Severity, msg: string): void {
-		this._extensionService._logOrShowMessage(severity, msg);
-	}
 	$activateExtension(extensionId: ExtensionIdentifier, activationEvent: string): Promise<void> {
 		return this._extensionService._activateById(extensionId, activationEvent);
 	}
diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index 7971709e39a..fe7977bff96 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -571,7 +571,6 @@ export interface MainThreadTaskShape extends IDisposable {
 }
 
 export interface MainThreadExtensionServiceShape extends IDisposable {
-	$localShowMessage(severity: Severity, msg: string): void;
 	$activateExtension(extensionId: ExtensionIdentifier, activationEvent: string | null): Promise<void>;
 	$onWillActivateExtension(extensionId: ExtensionIdentifier): void;
 	$onDidActivateExtension(extensionId: ExtensionIdentifier, startup: boolean, codeLoadingTime: number, activateCallTime: number, activateResolvedTime: number, activationEvent: string | null): void;