diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/i2c_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/i2c_api.c
index 7b268274c2..5515e85e84 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/i2c_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/i2c_api.c
@@ -101,11 +101,12 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
     i2c_conclr(obj, 1, 1, 1, 1);
     i2c_interface_enable(obj);
 
-    // If pins are not dedicated, set SCU functions
-    if (sda != P_DED) {
+    // Set SCU functions
+    if (scl == P_DED) {
+        // Enable dedicated I2C0 SDA and SCL pins (open drain)
+        LPC_SCU->SFSI2C0 = (1 << 11) | (1 << 3);
+    } else {
         pinmap_pinout(sda, PinMap_I2C_SDA);
-    }
-    if (scl != P_DED) {
         pinmap_pinout(scl, PinMap_I2C_SCL);
     }
 }
diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/port_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/port_api.c
index c32d4d4903..b25ec5d816 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/port_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/port_api.c
@@ -103,7 +103,7 @@ void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
     LPC_GPIO_T *port_reg = (LPC_GPIO_T *)(LPC_GPIO_PORT_BASE);
     
     // Do not use masking, because it prevents the use of the unmasked pins
-    // obj->MASK[port] = ~mask;
+    // port_reg->MASK[port] = ~mask;
     
     obj->reg_out = &port_reg->PIN[port];
     obj->reg_in  = &port_reg->PIN[port];