diff --git a/fpdfsdk/javascript/PublicMethods.cpp b/fpdfsdk/javascript/PublicMethods.cpp
index b5d4f7b..b349537 100644
--- a/fpdfsdk/javascript/PublicMethods.cpp
+++ b/fpdfsdk/javascript/PublicMethods.cpp
@@ -14,7 +14,7 @@
 #include <vector>
 
 #include "core/fpdfdoc/cpdf_interform.h"
-#include "core/fxcrt/fx_ext.h"
+#include "core/fxcrt/fx_extension.h"
 #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
 #include "fpdfsdk/cpdfsdk_interform.h"
 #include "fpdfsdk/javascript/Field.h"
diff --git a/fpdfsdk/javascript/global.cpp b/fpdfsdk/javascript/global.cpp
index 91c82e6..d7f17fa 100644
--- a/fpdfsdk/javascript/global.cpp
+++ b/fpdfsdk/javascript/global.cpp
@@ -9,7 +9,7 @@
 #include <utility>
 #include <vector>
 
-#include "core/fxcrt/fx_ext.h"
+#include "core/fxcrt/fx_extension.h"
 #include "fpdfsdk/javascript/JS_Define.h"
 #include "fpdfsdk/javascript/JS_EventHandler.h"
 #include "fpdfsdk/javascript/JS_GlobalData.h"
diff --git a/fpdfsdk/javascript/util.cpp b/fpdfsdk/javascript/util.cpp
index f88cdc6..4303342 100644
--- a/fpdfsdk/javascript/util.cpp
+++ b/fpdfsdk/javascript/util.cpp
@@ -12,7 +12,7 @@
 #include <string>
 #include <vector>
 
-#include "core/fxcrt/fx_ext.h"
+#include "core/fxcrt/fx_extension.h"
 #include "fpdfsdk/javascript/JS_Define.h"
 #include "fpdfsdk/javascript/JS_EventHandler.h"
 #include "fpdfsdk/javascript/JS_Object.h"