diff --git a/modules/twain_user/HGTwainImpl.cpp b/modules/twain_user/HGTwainImpl.cpp
index 9b9570a7..b34272ab 100644
--- a/modules/twain_user/HGTwainImpl.cpp
+++ b/modules/twain_user/HGTwainImpl.cpp
@@ -1,7 +1,7 @@
 #include "HGTwainImpl.hpp"
 #include "../base/HGInc.h"
 #include "../base/HGUtility.h"
-#include "app_cfg.h"
+#include "app_cfg.hpp"
 
 std::map<HWND, HGTwainDSMImpl*> HGTwainDSMImpl::m_mapWnd;
 
diff --git a/modules/twain_user/app_cfg.cpp b/modules/twain_user/app_cfg.cpp
index af1c1c12..9e91ea23 100644
--- a/modules/twain_user/app_cfg.cpp
+++ b/modules/twain_user/app_cfg.cpp
@@ -1,4 +1,4 @@
-#include "app_cfg.h"
+#include "app_cfg.hpp"
 #include "base/HGDef.h"
 #include "base/HGInc.h"
 #include "base/HGUtility.h"
diff --git a/modules/twain_user/app_cfg.h b/modules/twain_user/app_cfg.hpp
similarity index 100%
rename from modules/twain_user/app_cfg.h
rename to modules/twain_user/app_cfg.hpp