diff --git a/plugins/web/opentelemetry-instrumentation-user-interaction/src/internal-types.ts b/plugins/web/opentelemetry-instrumentation-user-interaction/src/internal-types.ts
index a845906632..a90007f239 100644
--- a/plugins/web/opentelemetry-instrumentation-user-interaction/src/internal-types.ts
+++ b/plugins/web/opentelemetry-instrumentation-user-interaction/src/internal-types.ts
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+/// <reference types="zone.js" />
 import { HrTime } from '@opentelemetry/api';
 import { EventName } from './types';