--- slock.c
+++ slock.c
@@ -15,6 +15,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <X11/extensions/Xrandr.h>
+#include <X11/extensions/Xinerama.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ -323,6 +453,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 					                     locks[screen]->win,
 					                     locks[screen]->colors[color]);
 					XClearWindow(dpy, locks[screen]->win);
+					writemessage(dpy, locks[screen]->win, screen);
 				}
 				oldc = color;
 			}