--- config.def.h
+++ config.def.h
@@ -35,7 +35,7 @@ static const Rule rules[] = {
 static const float mfact     = 0.55; /* factor of master area size [0.05..0.95] */
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
-static const int lockfullscreen = 0; /* 1 will force focus on the fullscreen window */
+static const int lockfullscreen = 1; /* 1 will force focus on the fullscreen window */
 
 static const Layout layouts[] = {
 	/* symbol     arrange function */
--- dwm.c
+++ dwm.c
@@ -565,6 +566,9 @@ configurenotify(XEvent *e)
 			drw_resize(drw, sw, bh);
 			updatebars();
 			for (m = mons; m; m = m->next) {
+				for (c = m->clients; c; c = c->next)
+					if (c->isfullscreen)
+						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 			}
 			focus(NULL);