diff --git a/wmMoonClock/Src/xutils.c b/wmMoonClock/Src/xutils.c
index 16cc37e..a450f43 100644
--- a/wmMoonClock/Src/xutils.c
+++ b/wmMoonClock/Src/xutils.c
@@ -39,7 +39,14 @@
 #include <X11/extensions/shape.h>
 #include "xutils.h"
 
-
+/*
+ *   Global variable
+ */
+Display     *display;
+Window          Root;
+Window          iconwin, win;
+int             screen; 
+int             DisplayDepth;
 
 /*
  *   X11 Variables 
diff --git a/wmMoonClock/Src/xutils.h b/wmMoonClock/Src/xutils.h
index aa8a795..eca50ea 100644
--- a/wmMoonClock/Src/xutils.h
+++ b/wmMoonClock/Src/xutils.h
@@ -18,11 +18,11 @@ typedef struct {
 /*
  *   Global variable
  */
-Display		*display;
-Window          Root;
-Window          iconwin, win;
-int             screen; 
-int             DisplayDepth;
+extern Display		*display;
+extern Window          Root;
+extern Window          iconwin, win;
+extern int             screen; 
+extern int             DisplayDepth;