diff --git a/stmhal/usb.c b/stmhal/usb.c
index 591cb321aa..c6303befb1 100644
--- a/stmhal/usb.c
+++ b/stmhal/usb.c
@@ -96,7 +96,7 @@ const mp_obj_tuple_t pyb_usb_hid_keyboard_obj = {
 };
 
 void pyb_usb_init0(void) {
-    USBD_CDC_SetInterrupt(-1, MP_STATE_PORT(mp_kbd_exception));
+    USBD_CDC_SetInterrupt(-1);
     MP_STATE_PORT(pyb_hid_report_desc) = MP_OBJ_NULL;
 }
 
@@ -146,7 +146,7 @@ void usb_vcp_set_interrupt_char(int c) {
         if (c != -1) {
             mp_obj_exception_clear_traceback(MP_STATE_PORT(mp_kbd_exception));
         }
-        USBD_CDC_SetInterrupt(c, MP_STATE_PORT(mp_kbd_exception));
+        USBD_CDC_SetInterrupt(c);
     }
 }
 
diff --git a/stmhal/usbd_cdc_interface.c b/stmhal/usbd_cdc_interface.c
index b42d3e2194..12aa38470c 100644
--- a/stmhal/usbd_cdc_interface.c
+++ b/stmhal/usbd_cdc_interface.c
@@ -41,6 +41,7 @@
 #include "usbd_cdc_interface.h"
 #include "pendsv.h"
 
+#include "py/mpstate.h"
 #include "py/obj.h"
 #include "irq.h"
 #include "timer.h"
@@ -79,7 +80,6 @@ static uint8_t UserTxBufPtrWaitCount = 0; // used to implement a timeout waiting
 static uint8_t UserTxNeedEmptyPacket = 0; // used to flush the USB IN endpoint if the last packet was exactly the endpoint packet size
 
 static int user_interrupt_char = -1;
-static void *user_interrupt_data = NULL;
 
 /* Private function prototypes -----------------------------------------------*/
 static int8_t CDC_Itf_Init     (void);
@@ -152,7 +152,6 @@ static int8_t CDC_Itf_Init(void)
      * This can happen if the USB enumeration occurs after the call to
      * USBD_CDC_SetInterrupt.
     user_interrupt_char = -1;
-    user_interrupt_data = NULL;
     */
 
     return (USBD_OK);
@@ -354,7 +353,7 @@ static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len) {
             if (*src == user_interrupt_char) {
                 char_found = true;
                 // raise exception when interrupts are finished
-                pendsv_nlr_jump(user_interrupt_data);
+                pendsv_nlr_jump(MP_STATE_PORT(mp_kbd_exception));
             } else {
                 if (char_found) {
                     *dest = *src;
@@ -386,9 +385,8 @@ int USBD_CDC_IsConnected(void) {
     return dev_is_connected;
 }
 
-void USBD_CDC_SetInterrupt(int chr, void *data) {
+void USBD_CDC_SetInterrupt(int chr) {
     user_interrupt_char = chr;
-    user_interrupt_data = data;
 }
 
 int USBD_CDC_TxHalfEmpty(void) {
diff --git a/stmhal/usbd_cdc_interface.h b/stmhal/usbd_cdc_interface.h
index f74b42bbee..2ea1a42c4a 100644
--- a/stmhal/usbd_cdc_interface.h
+++ b/stmhal/usbd_cdc_interface.h
@@ -32,7 +32,7 @@
 extern const USBD_CDC_ItfTypeDef USBD_CDC_fops;
 
 int USBD_CDC_IsConnected(void);
-void USBD_CDC_SetInterrupt(int chr, void *data);
+void USBD_CDC_SetInterrupt(int chr);
 
 int USBD_CDC_TxHalfEmpty(void);
 int USBD_CDC_Tx(const uint8_t *buf, uint32_t len, uint32_t timeout);