diff --git a/window.c b/window.c
index b653ee2fb..328bc4f5c 100644
--- a/window.c
+++ b/window.c
@@ -28,6 +28,9 @@
 
 extern AwesomeConf globalconf;
 
+/** Mask shorthands, used in event.c and window.c */
+#define BUTTONMASK     (ButtonPressMask | ButtonReleaseMask)
+
 /** Set client WM_STATE property
  * \param win Window
  * \param state state
diff --git a/window.h b/window.h
index de43c0860..ca5315a59 100644
--- a/window.h
+++ b/window.h
@@ -24,9 +24,6 @@
 
 #include <X11/Xlib.h>
 
-/** Mask shorthands, used in event.c and window.c */ 
-#define BUTTONMASK              (ButtonPressMask | ButtonReleaseMask) 
-
 int window_setstate(Window, long);
 long window_getstate(Window);
 Status window_configure(Window, Area, int);