diff --git a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/TARGET_DISCO_L475VG_IOT01A/PeripheralPins.c b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/TARGET_DISCO_L475VG_IOT01A/PeripheralPins.c
index 67ab04883c8..9b53dda8ff0 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/TARGET_DISCO_L475VG_IOT01A/PeripheralPins.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L475xG/TARGET_DISCO_L475VG_IOT01A/PeripheralPins.c
@@ -31,3 +31,23 @@
 #include "PeripheralPins.h"
 #include "mbed_toolchain.h"
 #include "PeripheralPinMaps.h"
+
+// List of GPIOs with limited functionality
+const PinList *pinmap_gpio_restricted_pins()
+{
+    static const PinName pins[] = {
+        D15,           // fixed pull-up (for I2C)
+        D14,           // fixed pull-up (for I2C)
+        PB_10,         // fixed pull-up (for I2C)
+        PB_11,         // fixed pull-up (for I2C)
+        RCC_OSC32_IN,  // OSC32_IN
+        RCC_OSC32_OUT, // OSC32_OUT
+        RCC_OSC_IN,    // OSC_IN
+        RCC_OSC_OUT    // OSC_OUT
+    };
+    static const PinList pin_list = {
+        sizeof(pins) / sizeof(pins[0]),
+        pins
+    };
+    return &pin_list;
+}