diff --git a/include/minigui.h b/include/minigui.h
index 4101937e..e744914b 100644
--- a/include/minigui.h
+++ b/include/minigui.h
@@ -2453,6 +2453,21 @@ MG_EXPORT int GUIAPI GetClipBoardByte (const char* cb_name,
      * @{
      */
 
+/**
+ * \fn DWORD GUIAPI GetTickCount (void)
+ * \brief Retrieves the tick counts that have elapsed since MiniGUI was started.
+ *
+ * This function retrieves the tick counts that have elapsed since MiniGUI
+ * was started. It is limited to the resolution of the system timer, i.e.
+ * for a general Linux box, the returned tick count value is in unit of 10ms.
+ *
+ * \return The tick counts value that have elapsed since MiniGUI was started.
+ *
+ * \note The prototype had changed since MiniGUI v3.2; The old one:
+ *      unsinged int GUIAPI GetTickCount (void);
+ */
+MG_EXPORT DWORD GUIAPI GetTickCount (void);
+
 /**
  * \fn void GUIAPI Ping (void)
  * \brief Makes a beep sound.
diff --git a/include/window.h b/include/window.h
index a9890bc4..9b58fbcf 100644
--- a/include/window.h
+++ b/include/window.h
@@ -8477,21 +8477,6 @@ MG_EXPORT BOOL GUIAPI ResetTimerEx (HWND hWnd, LINT id, DWORD speed,
 #define ResetTimer(hwnd, id, speed) \
                 ResetTimerEx(hwnd, id, speed, (TIMERPROC)INV_PTR)
 
-/**
- * \fn DWORD GUIAPI GetTickCount (void)
- * \brief Retrieves the tick counts that have elapsed since MiniGUI was started.
- *
- * This function retrieves the tick counts that have elapsed since MiniGUI
- * was started. It is limited to the resolution of the system timer, i.e.
- * for a general Linux box, the returned tick count value is in unit of 10ms.
- *
- * \return The tick counts value that have elapsed since MiniGUI was started.
- *
- * \note The prototype had changed since MiniGUI v3.2; The old one:
- *      unsinged int GUIAPI GetTickCount (void);
- */
-MG_EXPORT DWORD GUIAPI GetTickCount (void);
-
 /**
  * \fn BOOL GUIAPI IsTimerInstalled (HWND hWnd, LINT id)
  * \brief Determines whether a timer is installed.