diff --git a/xfa/fxfa/cxfa_ffapp.h b/xfa/fxfa/cxfa_ffapp.h
index d26b90c..fe41809 100644
--- a/xfa/fxfa/cxfa_ffapp.h
+++ b/xfa/fxfa/cxfa_ffapp.h
@@ -7,8 +7,8 @@
 #ifndef XFA_FXFA_CXFA_FFAPP_H_
 #define XFA_FXFA_CXFA_FFAPP_H_
 
-#include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/unowned_ptr.h"
+#include "core/fxcrt/widestring.h"
 #include "fxjs/gc/heap.h"
 #include "v8/include/cppgc/garbage-collected.h"
 #include "v8/include/cppgc/member.h"