diff --git a/targets/TARGET_STM/mbed_overrides.c b/targets/TARGET_STM/mbed_overrides.c
index d6d4006aa1..528e740c78 100644
--- a/targets/TARGET_STM/mbed_overrides.c
+++ b/targets/TARGET_STM/mbed_overrides.c
@@ -94,6 +94,72 @@ MBED_WEAK void TargetBSP_Init(void) {
     /** Do nothing */
 }
 
+void GPIO_Full_Init(void) {
+    GPIO_InitTypeDef GPIO_InitStruct;
+
+    GPIO_InitStruct.Pin        = GPIO_PIN_All;
+    GPIO_InitStruct.Mode       = GPIO_MODE_ANALOG;
+    GPIO_InitStruct.Speed      = GPIO_SPEED_FREQ_LOW;
+#if !TARGET_STM32F1
+    GPIO_InitStruct.Pull       = GPIO_NOPULL;
+    GPIO_InitStruct.Alternate  = 0;
+#endif
+#if defined(GPIOA)
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    __HAL_RCC_GPIOA_CLK_DISABLE();
+#endif
+#if defined(GPIOB)
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+    __HAL_RCC_GPIOB_CLK_DISABLE();
+#endif
+#if defined(GPIOC)
+    __HAL_RCC_GPIOC_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+    __HAL_RCC_GPIOC_CLK_DISABLE();
+#endif
+#if defined(GPIOD)
+    __HAL_RCC_GPIOD_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
+    __HAL_RCC_GPIOD_CLK_DISABLE();
+#endif
+#if defined(GPIOE)
+    __HAL_RCC_GPIOE_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
+    __HAL_RCC_GPIOE_CLK_DISABLE();
+#endif
+#if defined(GPIOF)
+    __HAL_RCC_GPIOF_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
+    __HAL_RCC_GPIOF_CLK_DISABLE();
+#endif
+#if defined(GPIOG)
+    __HAL_RCC_GPIOG_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+    __HAL_RCC_GPIOG_CLK_DISABLE();
+#endif
+#if defined(GPIOH)
+    __HAL_RCC_GPIOH_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
+    __HAL_RCC_GPIOH_CLK_DISABLE();
+#endif
+#if defined(GPIOI)
+    __HAL_RCC_GPIOI_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
+    __HAL_RCC_GPIOI_CLK_DISABLE();
+#endif
+#if defined(GPIOJ)
+    __HAL_RCC_GPIOJ_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);
+    __HAL_RCC_GPIOJ_CLK_DISABLE();
+#endif
+#if defined(GPIOK)
+    __HAL_RCC_GPIOK_CLK_ENABLE();
+    HAL_GPIO_Init(GPIOK, &GPIO_InitStruct);
+    __HAL_RCC_GPIOK_CLK_DISABLE();
+#endif
+}
 
 // This function is called after RAM initialization and before main.
 void mbed_sdk_init()
@@ -226,6 +292,9 @@ void mbed_sdk_init()
 #endif /* ! MBED_CONF_TARGET_LSE_AVAILABLE */
 #endif /* DEVICE_RTC */
 
+    /* Reset all GPIO */
+    GPIO_Full_Init();
+
     /* BSP initialization hook (external RAM, etc) */
     TargetBSP_Init();