diff --git a/radio/src/targets/common/arm/stm32/usbd_desc.c b/radio/src/targets/common/arm/stm32/usbd_desc.c
index 0a4a4cf27..12f1066d7 100644
--- a/radio/src/targets/common/arm/stm32/usbd_desc.c
+++ b/radio/src/targets/common/arm/stm32/usbd_desc.c
@@ -253,14 +253,6 @@ __ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END =
 /* Internal string descriptor. */
 __ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;
 
-#if defined ( __ICCARM__ ) /*!< IAR Compiler */
-  #pragma data_alignment=4
-#endif
-__ALIGN_BEGIN uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] __ALIGN_END = {
-  USB_SIZ_STRING_SERIAL,
-  USB_DESC_TYPE_STRING,
-};
-
 /**
   * @}
   */
diff --git a/radio/src/targets/common/arm/stm32/usbd_desc.h b/radio/src/targets/common/arm/stm32/usbd_desc.h
index af1b28770..6ad1fd765 100644
--- a/radio/src/targets/common/arm/stm32/usbd_desc.h
+++ b/radio/src/targets/common/arm/stm32/usbd_desc.h
@@ -50,8 +50,6 @@
 #define         DEVICE_ID2          (UID_BASE + 0x4)
 #define         DEVICE_ID3          (UID_BASE + 0x8)
 
-#define  USB_SIZ_STRING_SERIAL       0x1A
-
 /* USER CODE BEGIN EXPORTED_CONSTANTS */
 
 /* USER CODE END EXPORTED_CONSTANTS */