diff --git a/extensions/typescript-language-features/src/features/task.ts b/extensions/typescript-language-features/src/features/task.ts
index d5fa55ba87a..d9fa6f783d8 100644
--- a/extensions/typescript-language-features/src/features/task.ts
+++ b/extensions/typescript-language-features/src/features/task.ts
@@ -73,10 +73,10 @@ class TscTaskProvider implements vscode.TaskProvider {
 
 	public resolveTask(_task: vscode.Task): vscode.Task | undefined {
 		const definition = <TypeScriptTaskDefinition>_task.definition;
-		const badTsconfig = '\\tsconfig.json';
-		if ((definition.tsconfig.length > badTsconfig.length) && (definition.tsconfig.substring(definition.tsconfig.length - badTsconfig.length, definition.tsconfig.length) === badTsconfig)) {
+		const badTsconfig = /\\tsconfig.*\.json/;
+		if (badTsconfig.exec(definition.tsconfig) !== null) {
 			// Warn that the task has the wrong slash type
-			vscode.window.showWarningMessage(localize('badTsConfig', "Typescript Task in tasks.json contains \"\\\\\". Typescript tasks must use \"/\""));
+			vscode.window.showWarningMessage(localize('badTsConfig', "Typescript Task in tasks.json contains \"\\\\\". Typescript tasks tsconfig must use \"/\""));
 		}
 		return undefined;
 	}
diff --git a/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts b/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts
index 894a0b10e7a..1dad734a227 100644
--- a/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts
+++ b/src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts
@@ -470,17 +470,7 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 		return this._taskSystem.customExecutionComplete(task, result);
 	}
 
-	private isBadTsConfig(taskId: string | TaskIdentifier | undefined): taskId is string {
-		const badTsconfig = '\\tsconfig.json';
-		const tsc = 'tsc';
-		return typeof taskId === 'string' && (taskId.length > badTsconfig.length) && strings.equalsIgnoreCase(taskId.substring(taskId.length - badTsconfig.length, taskId.length), badTsconfig) && (taskId.substring(0, tsc.length) === tsc);
-	}
-
 	public getTask(folder: IWorkspaceFolder | string, identifier: string | TaskIdentifier, compareId: boolean = false): Promise<Task | undefined> {
-		if (this.isBadTsConfig(identifier)) {
-			return Promise.reject(new Error(nls.localize('badTsConfig', "Task '{0}' contains \"\\\\\". Typescript tasks must use \"/\"", identifier)));
-		}
-
 		const name = Types.isString(folder) ? folder : folder.name;
 		if (this.ignoredWorkspaceFolders.some(ignored => ignored.name === name)) {
 			return Promise.reject(new Error(nls.localize('TaskServer.folderIgnored', 'The folder {0} is ignored since it uses task version 0.1.0', name)));
@@ -2289,4 +2279,4 @@ export abstract class AbstractTaskService extends Disposable implements ITaskSer
 			this._taskSystem!.revealTask(task);
 		});
 	}
-}
\ No newline at end of file
+}