diff --git a/wmifinfo/xutils.c b/wmifinfo/xutils.c
index 92050fd..ed40202 100644
--- a/wmifinfo/xutils.c
+++ b/wmifinfo/xutils.c
@@ -41,6 +41,12 @@
 #include "xutils.h"
 
 
+Display		*display;
+Window          Root;
+Window          iconwin, win;
+int             screen;
+int             DisplayDepth;
+
 
 /*
  *   X11 Variables
diff --git a/wmifinfo/xutils.h b/wmifinfo/xutils.h
index fcd25f6..cf1ef5e 100644
--- a/wmifinfo/xutils.h
+++ b/wmifinfo/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;