diff --git a/Marlin/src/lcd/extui/mks_ui/draw_change_speed.cpp b/Marlin/src/lcd/extui/mks_ui/draw_change_speed.cpp
index da0ce3c811..556c855b25 100644
--- a/Marlin/src/lcd/extui/mks_ui/draw_change_speed.cpp
+++ b/Marlin/src/lcd/extui/mks_ui/draw_change_speed.cpp
@@ -62,7 +62,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
       break;
     case ID_C_DEC:
       if (!editingFlowrate)
-        feedrate_percentage = _MAX(MIN_EXT_SPEED_PERCENT, feedrate_percentage + uiCfg.stepPrintSpeed);
+        feedrate_percentage = _MAX(MIN_EXT_SPEED_PERCENT, feedrate_percentage - uiCfg.stepPrintSpeed);
       else {
         const int16_t new_flow = _MAX(MIN_EXT_SPEED_PERCENT, planner.flow_percentage[0] - uiCfg.stepPrintSpeed);
         planner.set_flow(0, new_flow);