diff --git a/variants/metro_m4/variant.h b/variants/metro_m4/variant.h
index 2b510e744..47739e4b3 100644
--- a/variants/metro_m4/variant.h
+++ b/variants/metro_m4/variant.h
@@ -88,7 +88,7 @@ extern "C"
 #define PIN_LED2             PIN_LED_RXL
 #define PIN_LED3             PIN_LED_TXL
 #define LED_BUILTIN          PIN_LED_13
-#define PIN_NEOPIXEL         (40)
+#define PIN_NEOPIXEL         (40u)
 
 /*
  * Analog pins
diff --git a/variants/metro_m4_airlift/variant.h b/variants/metro_m4_airlift/variant.h
index d078f2099..988bf2286 100644
--- a/variants/metro_m4_airlift/variant.h
+++ b/variants/metro_m4_airlift/variant.h
@@ -88,6 +88,7 @@ extern "C"
 #define PIN_LED2             PIN_LED_RXL
 #define PIN_LED3             PIN_LED_TXL
 #define LED_BUILTIN          PIN_LED_13
+#define PIN_NEOPIXEL         (40u)
 
 /*
  * Analog pins