diff --git a/wmmoonclock/src/xutils.c b/wmmoonclock/src/xutils.c
index b313d53..dc12f93 100644
--- a/wmmoonclock/src/xutils.c
+++ b/wmmoonclock/src/xutils.c
@@ -40,6 +40,15 @@
 
 
 
+/*
+ *   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 f9fc538..5edebec 100644
--- a/wmmoonclock/src/xutils.h
+++ b/wmmoonclock/src/xutils.h
@@ -20,11 +20,11 @@ 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;