diff --git a/nrf5/drivers/bluetooth/ble_drv.c b/nrf5/drivers/bluetooth/ble_drv.c
index 0050c91417..23a470d2d2 100644
--- a/nrf5/drivers/bluetooth/ble_drv.c
+++ b/nrf5/drivers/bluetooth/ble_drv.c
@@ -604,7 +604,7 @@ void ble_drv_attr_s_read(uint16_t conn_handle, uint16_t handle, uint16_t len, ui
 
 }
 
-void ble_drv_attr_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
+void ble_drv_attr_s_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
     ble_gatts_value_t gatts_value;
     memset(&gatts_value, 0, sizeof(gatts_value));
 
@@ -620,7 +620,7 @@ void ble_drv_attr_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uin
     }
 }
 
-void ble_drv_attr_notify(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
+void ble_drv_attr_s_notify(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data) {
     uint16_t               hvx_len = len;
     ble_gatts_hvx_params_t hvx_params;
 
diff --git a/nrf5/drivers/bluetooth/ble_drv.h b/nrf5/drivers/bluetooth/ble_drv.h
index 07f149695d..bac3ebf474 100644
--- a/nrf5/drivers/bluetooth/ble_drv.h
+++ b/nrf5/drivers/bluetooth/ble_drv.h
@@ -100,9 +100,9 @@ void ble_drv_attr_s_read(uint16_t conn_handle, uint16_t handle, uint16_t len, ui
 
 void ble_drv_attr_c_read(uint16_t conn_handle, uint16_t handle, mp_obj_t obj, ble_drv_gattc_char_data_callback_t cb);
 
-void ble_drv_attr_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data);
+void ble_drv_attr_s_write(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data);
 
-void ble_drv_attr_notify(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data);
+void ble_drv_attr_s_notify(uint16_t conn_handle, uint16_t handle, uint16_t len, uint8_t * p_data);
 
 void ble_drv_scan_start(void);
 
diff --git a/nrf5/drivers/bluetooth/ble_uart.c b/nrf5/drivers/bluetooth/ble_uart.c
index a2f8e1a7d2..61fd18a8ac 100644
--- a/nrf5/drivers/bluetooth/ble_uart.c
+++ b/nrf5/drivers/bluetooth/ble_uart.c
@@ -118,10 +118,10 @@ void mp_hal_stdout_tx_strn(const char *str, size_t len) {
 
         ubluepy_characteristic_obj_t * p_char = &ble_uart_char_tx;
 
-        ble_drv_attr_notify(p_char->p_service->p_periph->conn_handle,
-                            p_char->handle,
-                            send_len,
-                            buf);
+        ble_drv_attr_s_notify(p_char->p_service->p_periph->conn_handle,
+                              p_char->handle,
+                              send_len,
+                              buf);
 
         len -= send_len;
         buf += send_len;
diff --git a/nrf5/modules/ubluepy/ubluepy_characteristic.c b/nrf5/modules/ubluepy/ubluepy_characteristic.c
index 6c005fab34..a28ce20862 100644
--- a/nrf5/modules/ubluepy/ubluepy_characteristic.c
+++ b/nrf5/modules/ubluepy/ubluepy_characteristic.c
@@ -121,15 +121,15 @@ STATIC mp_obj_t char_write(mp_obj_t self_in, mp_obj_t data) {
     mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
 
     if (self->props & UBLUEPY_PROP_NOTIFY) {
-        ble_drv_attr_notify(self->p_service->p_periph->conn_handle,
-                            self->handle,
-                            bufinfo.len,
-                            bufinfo.buf);
+        ble_drv_attr_s_notify(self->p_service->p_periph->conn_handle,
+                              self->handle,
+                              bufinfo.len,
+                              bufinfo.buf);
     } else {
-        ble_drv_attr_write(self->p_service->p_periph->conn_handle,
-                           self->handle,
-                           bufinfo.len,
-                           bufinfo.buf);
+        ble_drv_attr_s_write(self->p_service->p_periph->conn_handle,
+                             self->handle,
+                             bufinfo.len,
+                             bufinfo.buf);
     }
 
     return mp_const_none;