diff --git a/BESM6/besm6_panel.c b/BESM6/besm6_panel.c
index af03dae1..e3e4317a 100644
--- a/BESM6/besm6_panel.c
+++ b/BESM6/besm6_panel.c
@@ -382,6 +382,8 @@ t_stat besm6_close_panel (UNIT *u, int32 val, char *cptr, void *desc)
 {
     if (! screen)
         return SCPE_NOTATT;
+    if (font_big) TTF_CloseFont(font_big);
+    if (font_small) TTF_CloseFont(font_small);
     TTF_Quit();
     SDL_Quit();
     screen = 0;