diff --git a/fpdfsdk/cpdfsdk_interactiveform.cpp b/fpdfsdk/cpdfsdk_interactiveform.cpp
index 2f888b4..9e7c548 100644
--- a/fpdfsdk/cpdfsdk_interactiveform.cpp
+++ b/fpdfsdk/cpdfsdk_interactiveform.cpp
@@ -115,8 +115,7 @@
     : m_pFormFillEnv(pFormFillEnv),
       m_pInteractiveForm(pdfium::MakeUnique<CPDF_InteractiveForm>(
           m_pFormFillEnv->GetPDFDocument())) {
-  ASSERT(m_pFormFillEnv);
-  m_pInteractiveForm->SetFormNotify(this);
+  m_pInteractiveForm->SetNotifierIface(this);
   RemoveAllHighLights();
 }