diff --git a/variants/nrf52840/heltec_mesh_node_t114-inkhud/variant.cpp b/variants/nrf52840/heltec_mesh_node_t114-inkhud/variant.cpp
index 16880e8e5..b8b0e21c5 100644
--- a/variants/nrf52840/heltec_mesh_node_t114-inkhud/variant.cpp
+++ b/variants/nrf52840/heltec_mesh_node_t114-inkhud/variant.cpp
@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"
diff --git a/variants/nrf52840/heltec_mesh_node_t114/variant.cpp b/variants/nrf52840/heltec_mesh_node_t114/variant.cpp
index 16880e8e5..b8b0e21c5 100644
--- a/variants/nrf52840/heltec_mesh_node_t114/variant.cpp
+++ b/variants/nrf52840/heltec_mesh_node_t114/variant.cpp
@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"
diff --git a/variants/nrf52840/heltec_mesh_solar/variant.cpp b/variants/nrf52840/heltec_mesh_solar/variant.cpp
index e2c594a13..3b2612da8 100644
--- a/variants/nrf52840/heltec_mesh_solar/variant.cpp
+++ b/variants/nrf52840/heltec_mesh_solar/variant.cpp
@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"