diff --git a/fpdfsdk/src/javascript/Field.h b/fpdfsdk/src/javascript/Field.h
index 4fba1dd..49103c8 100644
--- a/fpdfsdk/src/javascript/Field.h
+++ b/fpdfsdk/src/javascript/Field.h
@@ -7,7 +7,8 @@
 #ifndef FPDFSDK_SRC_JAVASCRIPT_FIELD_H_
 #define FPDFSDK_SRC_JAVASCRIPT_FIELD_H_
 
-#include <string>  // For std::wstring.
+#include <string>
+#include <vector>
 
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"  // For CPWL_Color.
 #include "fpdfsdk/src/javascript/JS_Define.h"