--- xlock.c.orig.orig	Sat Aug 18 11:14:33 2001
+++ xlock.c	Sat Aug 18 11:15:27 2001
@@ -392,6 +392,8 @@
 	XColor      color;
 	int         i;
 	time_t      start, now;
+	struct timeval drawstart, drawstop;
+	unsigned long drawelapsed;
 	int         orig_pause;
 
 	(void) memset((char *) &mi, 0, sizeof (mi));
@@ -545,10 +547,14 @@
 
 	hack_init(&mi);
 	do {
+		(void) gettimeofday(&drawstart, NULL);
 		hack_draw(&mi);
 		XSync(dpy, False);
-		if (mi.pause)
-			(void) usleep(mi.pause);
+		(void) gettimeofday(&drawstop, NULL);
+		drawelapsed = (drawstop.tv_sec - drawstart.tv_sec)*1000000 + 
+			(drawstop.tv_usec - drawstart.tv_usec);
+		if (mi.pause > drawelapsed)
+			(void) usleep(mi.pause - drawelapsed);
 		mi.pause = orig_pause;
 
 		if (hack_free) {