diff --git a/libraries/USBDevice/inc/usbd_desc.h b/libraries/USBDevice/inc/usbd_desc.h
index aa832b2772..a1b84608fb 100644
--- a/libraries/USBDevice/inc/usbd_desc.h
+++ b/libraries/USBDevice/inc/usbd_desc.h
@@ -28,7 +28,18 @@
   /* Exported constants --------------------------------------------------------*/
   #define  DEVICE_ID1                  (UID_BASE)
   #define  DEVICE_ID2                  (UID_BASE + 0x4U)
-  #define  DEVICE_ID3                  (UID_BASE + 0x8U)
+  /*
+  * On STM32L0 and STM32L1 the three unique-ID words are NOT contiguous:
+  * the reference manuals place bits 95:64 at offset 0x14, not 0x08
+  * (RM0376/RM0377/RM0367/RM0451 "Unique device ID registers (96 bits)",
+  * and RM0038 for STM32L1). UID_BASE + 0x8U is a reserved location there.
+  * ST's own HAL_GetUIDw2() already uses 0x14U for these two families.
+  */
+  #if defined(STM32L0xx) || defined(STM32L1xx)
+    #define  DEVICE_ID3                (UID_BASE + 0x14U)
+  #else
+    #define  DEVICE_ID3                (UID_BASE + 0x8U)
+  #endif
 
   /*
   * USB Billboard Class USER string desc Defines Template