diff --git a/top/top.c b/top/top.c
index e64c8660..52b0a050 100644
--- a/top/top.c
+++ b/top/top.c
@@ -4467,9 +4467,12 @@ static void whack_terminal (void) {
 static void win_names (WIN_t *q, const char *name) {
    /* note: sprintf/snprintf results are "undefined" when src==dst,
             according to C99 & POSIX.1-2001 (thanks adc) */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic warning "-Wformat-truncation"
    if (q->rc.winname != name)
       snprintf(q->rc.winname, sizeof(q->rc.winname), "%s", name);
    snprintf(q->grpname, sizeof(q->grpname), "%d:%s", q->winnum, name);
+#pragma GCC diagnostic pop
 } // end: win_names