1 files changed, 1 insertions, 1 deletions

diff --git a/src/xfns.c b/src/xfns.c
index 58163101f8a..8788906e773 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -187,7 +187,7 @@ Lisp_Object Qauto_raise;
 Lisp_Object Qauto_lower;
 Lisp_Object Qborder_color;
 Lisp_Object Qborder_width;
-Lisp_Object Qbox;
+extern Lisp_Object Qbox;
 Lisp_Object Qcursor_color;
 Lisp_Object Qcursor_type;
 Lisp_Object Qgeometry;