diff --git a/targets/TARGET_NUVOTON/TARGET_M251/i2c_api.c b/targets/TARGET_NUVOTON/TARGET_M251/i2c_api.c
index e0ea415271..42e32116f5 100644
--- a/targets/TARGET_NUVOTON/TARGET_M251/i2c_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M251/i2c_api.c
@@ -23,6 +23,7 @@
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
+#include "gpio_api.h"
 #include "nu_modutil.h"
 #include "nu_miscutil.h"
 #include "nu_bitutil.h"
diff --git a/targets/TARGET_NUVOTON/TARGET_M261/i2c_api.c b/targets/TARGET_NUVOTON/TARGET_M261/i2c_api.c
index 4e1752fd29..597326edeb 100644
--- a/targets/TARGET_NUVOTON/TARGET_M261/i2c_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M261/i2c_api.c
@@ -22,6 +22,7 @@
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
+#include "gpio_api.h"
 #include "nu_modutil.h"
 #include "nu_miscutil.h"
 #include "nu_bitutil.h"
diff --git a/targets/TARGET_NUVOTON/TARGET_M451/i2c_api.c b/targets/TARGET_NUVOTON/TARGET_M451/i2c_api.c
index 452131c791..5dac613f20 100644
--- a/targets/TARGET_NUVOTON/TARGET_M451/i2c_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M451/i2c_api.c
@@ -21,6 +21,7 @@
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
+#include "gpio_api.h"
 #include "nu_modutil.h"
 #include "nu_miscutil.h"
 #include "nu_bitutil.h"
diff --git a/targets/TARGET_NUVOTON/TARGET_NANO100/i2c_api.c b/targets/TARGET_NUVOTON/TARGET_NANO100/i2c_api.c
index 72aa9cda7a..a8d5a6dbb2 100644
--- a/targets/TARGET_NUVOTON/TARGET_NANO100/i2c_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_NANO100/i2c_api.c
@@ -21,6 +21,7 @@
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
+#include "gpio_api.h"
 #include "nu_modutil.h"
 #include "nu_miscutil.h"
 #include "nu_bitutil.h"
diff --git a/targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c b/targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c
index e88835cc65..941bd78d81 100644
--- a/targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c
@@ -21,6 +21,7 @@
 #include "cmsis.h"
 #include "pinmap.h"
 #include "PeripheralPins.h"
+#include "gpio_api.h"
 #include "nu_modutil.h"
 #include "nu_miscutil.h"
 #include "nu_bitutil.h"