diff --git a/variants/metro_m4_airlift/variant.h b/variants/metro_m4_airlift/variant.h
index dcb8002f..691f3444 100644
--- a/variants/metro_m4_airlift/variant.h
+++ b/variants/metro_m4_airlift/variant.h
@@ -130,6 +130,7 @@ static const uint8_t ATN = PIN_ATN;
 #define SPIWIFI_RESET   ESP32_RESETN
 #define NINA_GPIO0      ESP32_GPIO0
 #define NINA_RESETN     ESP32_RESETN
+#define NINA_ACK        SPIWIFI_ACK
 
 
 /*
diff --git a/variants/pyportal_m4/variant.h b/variants/pyportal_m4/variant.h
index 17d02b1d..c0cf50bf 100644
--- a/variants/pyportal_m4/variant.h
+++ b/variants/pyportal_m4/variant.h
@@ -133,6 +133,7 @@ static const uint8_t ATN = PIN_ATN;
 #define SPIWIFI_RESET   7
 #define NINA_GPIO0      ESP32_GPIO0
 #define NINA_RESETN     ESP32_RESETN
+#define NINA_ACK        SPIWIFI_ACK
 #define SerialESP32     Serial1
 
 /*