diff --git a/etc/api/angular_devkit/architect/src/index.d.ts b/etc/api/angular_devkit/architect/src/index.d.ts
index db5ff0a7f9..be03aecd60 100644
--- a/etc/api/angular_devkit/architect/src/index.d.ts
+++ b/etc/api/angular_devkit/architect/src/index.d.ts
@@ -1,5 +1,5 @@
 export declare class Architect {
-    constructor(_host: ArchitectHost, _registry?: json.schema.SchemaRegistry, additionalJobRegistry?: experimental.jobs.Registry);
+    constructor(_host: ArchitectHost, registry?: json.schema.SchemaRegistry, additionalJobRegistry?: experimental.jobs.Registry);
     has(name: experimental.jobs.JobName): Observable<boolean>;
     scheduleBuilder(name: string, options: json.JsonObject, scheduleOptions?: ScheduleOptions): Promise<BuilderRun>;
     scheduleTarget(target: Target, overrides?: json.JsonObject, scheduleOptions?: ScheduleOptions): Promise<BuilderRun>;
diff --git a/packages/angular_devkit/architect/src/architect.ts b/packages/angular_devkit/architect/src/architect.ts
index fb92acc2e0..e2ecb429e2 100644
--- a/packages/angular_devkit/architect/src/architect.ts
+++ b/packages/angular_devkit/architect/src/architect.ts
@@ -309,23 +309,23 @@ export class Architect {
 
   constructor(
     private _host: ArchitectHost,
-    private _registry: json.schema.SchemaRegistry = new json.schema.CoreSchemaRegistry(),
+    registry: json.schema.SchemaRegistry = new json.schema.CoreSchemaRegistry(),
     additionalJobRegistry?: experimental.jobs.Registry,
   ) {
     const privateArchitectJobRegistry = new experimental.jobs.SimpleJobRegistry();
     // Create private jobs.
     privateArchitectJobRegistry.register(_getTargetOptionsFactory(_host));
     privateArchitectJobRegistry.register(_getBuilderNameForTargetFactory(_host));
-    privateArchitectJobRegistry.register(_validateOptionsFactory(_host, _registry));
+    privateArchitectJobRegistry.register(_validateOptionsFactory(_host, registry));
 
     const jobRegistry = new experimental.jobs.FallbackRegistry([
-      new ArchitectTargetJobRegistry(_host, _registry, this._jobCache, this._infoCache),
-      new ArchitectBuilderJobRegistry(_host, _registry, this._jobCache, this._infoCache),
+      new ArchitectTargetJobRegistry(_host, registry, this._jobCache, this._infoCache),
+      new ArchitectBuilderJobRegistry(_host, registry, this._jobCache, this._infoCache),
       privateArchitectJobRegistry,
       ...(additionalJobRegistry ? [additionalJobRegistry] : []),
     ] as experimental.jobs.Registry[]);
 
-    this._scheduler = new experimental.jobs.SimpleScheduler(jobRegistry, _registry);
+    this._scheduler = new experimental.jobs.SimpleScheduler(jobRegistry, registry);
   }
 
   has(name: experimental.jobs.JobName) {