diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/i2c_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/i2c_api.c
index e399f62b20..5619a51435 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/i2c_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/i2c_api.c
@@ -122,6 +122,15 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
     
     pinmap_pinout(sda, PinMap_I2C_SDA);
     pinmap_pinout(scl, PinMap_I2C_SCL);
+
+    // OpenDrain must explicitly be enabled for p0.0 and p0.1
+    if (sda == P0_0) {
+        pin_mode(sda, OpenDrain);
+    }
+    if (scl == P0_1) {
+        pin_mode(scl, OpenDrain);
+    }
+
 }
 
 inline int i2c_start(i2c_t *obj) {
diff --git a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/port_api.c b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/port_api.c
index 5f44eedd9e..8fe23e6dd0 100644
--- a/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/port_api.c
+++ b/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC408X/port_api.c
@@ -17,8 +17,9 @@
 #include "pinmap.h"
 #include "gpio_api.h"
 
+
 PinName port_pin(PortName port, int pin_n) {
-    return (PinName)(LPC_GPIO0_BASE + ((port << PORT_SHIFT) | pin_n));
+    return (PinName)(((port << PORT_SHIFT) | pin_n));
 }
 
 void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {