diff --git a/win/X11/winX.c b/win/X11/winX.c
index d9a7cacf4..db95dea15 100644
--- a/win/X11/winX.c
+++ b/win/X11/winX.c
@@ -991,7 +991,8 @@ X11_putstr(winid window, int attr, const char *str)
         X11_destroy_nhwindow(window);
         *wp = window_list[new_win];
         window_list[new_win].type = NHW_NONE; /* allow re-use */
-        /* fall through */
+        FALLTHROUGH;
+        /*FALLTHRU*/
     case NHW_TEXT:
         add_to_text_window(wp, attr, str);
         break;
diff --git a/win/curses/cursinvt.c b/win/curses/cursinvt.c
index 3b0749d5c..4095ceb5a 100644
--- a/win/curses/cursinvt.c
+++ b/win/curses/cursinvt.c
@@ -187,6 +187,7 @@ curs_scroll_invt(WINDOW *win UNUSED)
             res = 1;
             break;
         }
+        FALLTHROUGH;
         /*FALLTHRU*/
     case KEY_RIGHT:
     case KEY_NPAGE: