diff --git a/Tools/AP_Periph/AP_Periph.cpp b/Tools/AP_Periph/AP_Periph.cpp
index f0cf5cf488..b2c43949bc 100644
--- a/Tools/AP_Periph/AP_Periph.cpp
+++ b/Tools/AP_Periph/AP_Periph.cpp
@@ -151,6 +151,9 @@ void AP_Periph_FW::update()
 #endif
         hal.scheduler->delay(1);
         show_stack_usage();
+#endif
+#ifdef HAL_PERIPH_NEOPIXEL_COUNT
+        hal.rcout->set_neopixel_num_LEDs(HAL_PERIPH_NEOPIXEL_CHAN, HAL_PERIPH_NEOPIXEL_COUNT);
 #endif
     }
     can_update();