diff --git a/openbox/openbox.c b/openbox/openbox.c
index cb36eba1..55f3d042 100644
--- a/openbox/openbox.c
+++ b/openbox/openbox.c
@@ -58,7 +58,7 @@ gchar      *ob_sm_id;
 RrInstance *ob_rr_inst;
 RrTheme    *ob_rr_theme;
 Display    *ob_display;
-int         ob_screen;
+gint        ob_screen;
 Window      ob_root;
 ObState     ob_state;
 Cursor      ob_cursors[OB_NUM_CURSORS];
diff --git a/openbox/openbox.h b/openbox/openbox.h
index bf250a59..c6a2f210 100644
--- a/openbox/openbox.h
+++ b/openbox/openbox.h
@@ -25,7 +25,7 @@ SnDisplay *ob_sn_display;
 #endif
 
 /*! The number of the screen on which we're running */
-extern int      ob_screen;
+extern gint     ob_screen;
 /*! The root window */
 extern Window   ob_root;