diff --git a/command.c b/command.c
index 48f3a7e6b4..57ce7d8d20 100644
--- a/command.c
+++ b/command.c
@@ -2017,6 +2017,7 @@ static int mp_property_sub_scale(m_option_t *prop, int action, void *arg,
 #endif
         text_font_scale_factor = *(float *) arg;
         force_load_font = 1;
+        vo_osd_changed(OSDTYPE_SUBTITLE);
         return M_PROPERTY_OK;
     case M_PROPERTY_STEP_UP:
     case M_PROPERTY_STEP_DOWN:
@@ -2032,6 +2033,7 @@ static int mp_property_sub_scale(m_option_t *prop, int action, void *arg,
                                   (action == M_PROPERTY_STEP_UP ? 1.0 : -1.0);
         M_PROPERTY_CLAMP(prop, text_font_scale_factor);
         force_load_font = 1;
+        vo_osd_changed(OSDTYPE_SUBTITLE);
         return M_PROPERTY_OK;
     default:
 #ifdef CONFIG_ASS