diff --git a/src/vs/workbench/parts/debug/common/debug.ts b/src/vs/workbench/parts/debug/common/debug.ts
index c97d8d042dc9ade7ed2c3c1d670e88160437e46a..33a7c77c1192ebad2b06f2ee4672eba00be20bdc 100644
--- a/src/vs/workbench/parts/debug/common/debug.ts
+++ b/src/vs/workbench/parts/debug/common/debug.ts
@@ -302,6 +302,7 @@ export interface IExtHostConfig extends IEnvConfig {
 	port?: number;
 	sourceMaps?: boolean;
 	outDir?: string;
+	outFiles?: string;
 }
 
 export interface IConfig extends IEnvConfig {
diff --git a/src/vs/workbench/parts/debug/electron-browser/debugService.ts b/src/vs/workbench/parts/debug/electron-browser/debugService.ts
index 1ddf8591d223c0e4175731ffedb38725b5f3023e..78a6ed53169b69e47d9a71c3ab272e76dd062c85 100644
--- a/src/vs/workbench/parts/debug/electron-browser/debugService.ts
+++ b/src/vs/workbench/parts/debug/electron-browser/debugService.ts
@@ -770,7 +770,7 @@ export class DebugService implements debug.IDebugService {
 				request: 'attach',
 				port,
 				sourceMaps: configuration.sourceMaps,
-				outDir: configuration.outDir,
+				outFiles: configuration.outDir || configuration.outFiles,
 				debugServer: configuration.debugServer
 			})
 		);