diff --git a/etc/api/angular_devkit/architect/src/index.d.ts b/etc/api/angular_devkit/architect/src/index.d.ts
index d20842d03b..6abeeeb4c1 100644
--- a/etc/api/angular_devkit/architect/src/index.d.ts
+++ b/etc/api/angular_devkit/architect/src/index.d.ts
@@ -37,6 +37,7 @@ export interface BuilderContext {
     architect: Architect;
     host: virtualFs.Host<{}>;
     logger: logging.Logger;
+    targetSpecifier?: TargetSpecifier;
     workspace: experimental.workspace.Workspace;
 }