diff --git a/packages/upgrade/src/common/src/downgrade_component.ts b/packages/upgrade/src/common/src/downgrade_component.ts
index 32ed154411..6aed7e6ddb 100644
--- a/packages/upgrade/src/common/src/downgrade_component.ts
+++ b/packages/upgrade/src/common/src/downgrade_component.ts
@@ -11,7 +11,7 @@ import {ComponentFactory, ComponentFactoryResolver, Injector, NgZone, Type} from
 import {IAnnotatedFunction, IAttributes, IAugmentedJQuery, ICompileService, IDirective, IInjectorService, INgModelController, IParseService, IScope} from './angular1';
 import {$COMPILE, $INJECTOR, $PARSE, INJECTOR_KEY, LAZY_MODULE_REF, REQUIRE_INJECTOR, REQUIRE_NG_MODEL} from './constants';
 import {DowngradeComponentAdapter} from './downgrade_component_adapter';
-import {SyncPromise, Thenable, isThenable} from './promise_util';
+import {SyncPromise, Thenable} from './promise_util';
 import {LazyModuleRef, UpgradeAppType, controllerKey, getDowngradedModuleCount, getTypeName, getUpgradeAppType, validateInjectionKey} from './util';