diff --git a/dwm.c b/dwm.c
index 1249997..515e4e4 100644
--- a/dwm.c
+++ b/dwm.c
@@ -395,7 +395,8 @@ arrange(Monitor *m)
 void
 arrangemon(Monitor *m)
 {
-	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
+	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof(m->ltsymbol) - 1);
+	m->ltsymbol[sizeof(m->ltsymbol) - 1] = '\0';
 	if (m->lt[m->sellt]->arrange)
 		m->lt[m->sellt]->arrange(m);
 }
@@ -645,7 +646,8 @@ createmon(void)
 	m->topbar = topbar;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
-	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
+	strncpy(m->ltsymbol, layouts[0].symbol, sizeof(m->ltsymbol) - 1);
+	m->ltsymbol[sizeof(m->ltsymbol) - 1] = '\0';
 	return m;
 }