diff --git a/targets/ESP32/_common/WireProtocol_HAL_Interface.c b/targets/ESP32/_common/WireProtocol_HAL_Interface.c
index c064c337bb..b206ff0240 100644
--- a/targets/ESP32/_common/WireProtocol_HAL_Interface.c
+++ b/targets/ESP32/_common/WireProtocol_HAL_Interface.c
@@ -47,18 +47,16 @@ bool WP_Initialise(COM_HANDLE port)
 
     ASSERT(WP_Port <= SOC_UART_NUM);
 
-    uart_config_t uart_config = {
-        // baudrate
-        .baud_rate = TARGET_SERIAL_BAUDRATE,
-        // baudrate
-        .data_bits = UART_DATA_8_BITS,
-        // parity mode
-        .parity = UART_PARITY_DISABLE,
-        // stop bit mode
-        .stop_bits = UART_STOP_BITS_1,
-        // hardware flow control(cts/rts)
-        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
-    };
+    uart_config_t uart_config = {// baudrate
+                                 .baud_rate = TARGET_SERIAL_BAUDRATE,
+                                 // baudrate
+                                 .data_bits = UART_DATA_8_BITS,
+                                 // parity mode
+                                 .parity = UART_PARITY_DISABLE,
+                                 // stop bit mode
+                                 .stop_bits = UART_STOP_BITS_1,
+                                 // hardware flow control(cts/rts)
+                                 .flow_ctrl = UART_HW_FLOWCTRL_DISABLE};
 
     uart_param_config(WP_Port, &uart_config);
 
@@ -70,7 +68,7 @@ bool WP_Initialise(COM_HANDLE port)
         UART_PIN_NO_CHANGE);
 
     // setup UART driver with UART queue
-    uart_driver_install(WP_Port, 256, 256, 0, NULL, 0);
+    uart_driver_install(WP_Port, 256, 256, 0, NULL, ESP_INTR_FLAG_IRAM);
 
     WP_Port_Intitialised = true;
 
diff --git a/targets/ESP32/_nanoCLR/System.IO.Ports/sys_io_ser_native_System_IO_Ports_SerialPort.cpp b/targets/ESP32/_nanoCLR/System.IO.Ports/sys_io_ser_native_System_IO_Ports_SerialPort.cpp
index 72c5d2111e..312480e929 100644
--- a/targets/ESP32/_nanoCLR/System.IO.Ports/sys_io_ser_native_System_IO_Ports_SerialPort.cpp
+++ b/targets/ESP32/_nanoCLR/System.IO.Ports/sys_io_ser_native_System_IO_Ports_SerialPort.cpp
@@ -833,12 +833,14 @@ HRESULT Library_sys_io_ser_native_System_IO_Ports_SerialPort::NativeInit___VOID(
     // Install driver
     esp_err = uart_driver_install(
         uart_num,
-        UART_BUFER_SIZE,            // rx_buffer_size,
-        0,                          // tx_buffer_size, not buffered
-        20,                         // queue_size
-        &(palUart->UartEventQueue), // QueueHandle_t *uart_queue ( none for now )
-        0                           // intr_alloc_flags
-    );
+        // rx_buffer_size
+        UART_BUFER_SIZE,
+        // tx_buffer_size, not buffered
+        0,
+        // queue_size
+        20,
+        &(palUart->UartEventQueue),
+        ESP_INTR_FLAG_IRAM);
     if (esp_err != ESP_OK)
     {
         ESP_LOGE(TAG, "Failed to install uart driver");
diff --git a/targets/ESP32/_nanoCLR/Windows.Devices.SerialCommunication/win_dev_serial_native_Windows_Devices_SerialCommunication_SerialDevice.cpp b/targets/ESP32/_nanoCLR/Windows.Devices.SerialCommunication/win_dev_serial_native_Windows_Devices_SerialCommunication_SerialDevice.cpp
index e5a070d857..6dbb89abd7 100644
--- a/targets/ESP32/_nanoCLR/Windows.Devices.SerialCommunication/win_dev_serial_native_Windows_Devices_SerialCommunication_SerialDevice.cpp
+++ b/targets/ESP32/_nanoCLR/Windows.Devices.SerialCommunication/win_dev_serial_native_Windows_Devices_SerialCommunication_SerialDevice.cpp
@@ -326,12 +326,16 @@ HRESULT Library_win_dev_serial_native_Windows_Devices_SerialCommunication_Serial
     // Install driver
     esp_err = uart_driver_install(
         uart_num,
-        UART_BUFER_SIZE,            // rx_buffer_size,
-        0,                          // tx_buffer_size, not buffered
-        20,                         // queue_size
-        &(palUart->UartEventQueue), // QueueHandle_t *uart_queue ( none for now )
-        0                           // intr_alloc_flags
-    );
+        // rx_buffer_size,
+        UART_BUFER_SIZE,
+        // tx_buffer_size, not buffered
+        0,
+        // queue_size
+        20,
+        // QueueHandle_t *uart_queue ( none for now )
+        &(palUart->UartEventQueue),
+
+        ESP_INTR_FLAG_IRAM);
     if (esp_err != ESP_OK)
     {
         ESP_LOGE(TAG, "Failed to install uart driver");
diff --git a/targets/ESP32/_nanoCLR/nanoFramework.Devices.OneWire/nf_devices_onewire_native_nanoFramework_Devices_OneWire_OneWireController.cpp b/targets/ESP32/_nanoCLR/nanoFramework.Devices.OneWire/nf_devices_onewire_native_nanoFramework_Devices_OneWire_OneWireController.cpp
index f1e2ef267c..b30355b05d 100644
--- a/targets/ESP32/_nanoCLR/nanoFramework.Devices.OneWire/nf_devices_onewire_native_nanoFramework_Devices_OneWire_OneWireController.cpp
+++ b/targets/ESP32/_nanoCLR/nanoFramework.Devices.OneWire/nf_devices_onewire_native_nanoFramework_Devices_OneWire_OneWireController.cpp
@@ -50,7 +50,7 @@ bool oneWireInit()
             UART_PIN_NO_CHANGE,
             UART_PIN_NO_CHANGE) != ESP_OK)
         return false;
-    if (uart_driver_install(UartDriver, UART_FIFO_LEN * 2, 0, 0, NULL, 0) != ESP_OK)
+    if (uart_driver_install(UartDriver, UART_FIFO_LEN * 2, 0, 0, NULL, ESP_INTR_FLAG_IRAM) != ESP_OK)
         return false;
 
 #if (ONEWIRE_USE_MUTUAL_EXCLUSION == TRUE)