diff --git a/fpdfsdk/cpdfsdk_annothandlermgr.cpp b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
index 7d253c8..619d66d 100644
--- a/fpdfsdk/cpdfsdk_annothandlermgr.cpp
+++ b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
@@ -17,6 +17,7 @@
 #include "fpdfsdk/cpdfsdk_pageview.h"
 #include "fpdfsdk/cpdfsdk_widget.h"
 #include "fpdfsdk/cpdfsdk_widgethandler.h"
+#include "public/fpdf_fwlevent.h"
 #include "third_party/base/ptr_util.h"
 
 #ifdef PDF_ENABLE_XFA