diff --git a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M460/m460_eth.c b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M460/m460_eth.c
index 591de2204f..275a3af904 100644
--- a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M460/m460_eth.c
+++ b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M460/m460_eth.c
@@ -20,6 +20,7 @@
 //#include <stdbool.h>
 #include "m460_eth.h"
 #include "mbed_toolchain.h"
+#include "mbed_interface.h"
 //#define NU_TRACE
 #include "numaker_eth_hal.h"
 
diff --git a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.c b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.c
index 6543beac6f..30de209f81 100644
--- a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.c
+++ b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_M480/m480_eth.c
@@ -20,6 +20,7 @@
 #include <stdbool.h>
 #include "m480_eth.h"
 #include "mbed_toolchain.h"
+#include "mbed_interface.h"
 //#define NU_TRACE
 #include "numaker_eth_hal.h"
 
diff --git a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.c b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.c
index 209fb02472..d9dbb51d77 100644
--- a/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.c
+++ b/connectivity/drivers/emac/TARGET_NUVOTON_EMAC/TARGET_NUC472/nuc472_eth.c
@@ -20,6 +20,7 @@
 #include <stdbool.h>
 #include "nuc472_eth.h"
 #include "mbed_toolchain.h"
+#include "mbed_interface.h"
 //#define NU_TRACE
 #include "numaker_eth_hal.h"