diff --git a/libc/kernel/uapi/linux/usb/ch9.h b/libc/kernel/uapi/linux/usb/ch9.h
index 9ddc640..dd66991 100644
--- a/libc/kernel/uapi/linux/usb/ch9.h
+++ b/libc/kernel/uapi/linux/usb/ch9.h
@@ -203,7 +203,10 @@
 struct usb_string_descriptor {
   __u8 bLength;
   __u8 bDescriptorType;
-  __le16 wData[1];
+  union {
+    __le16 legacy_padding;
+    __DECLARE_FLEX_ARRAY(__le16, wData);
+  };
 } __attribute__((packed));
 struct usb_interface_descriptor {
   __u8 bLength;
@@ -441,7 +444,10 @@
 #define USB_SSP_MIN_RX_LANE_COUNT (0xf << 8)
 #define USB_SSP_MIN_TX_LANE_COUNT (0xf << 12)
   __le16 wReserved;
-  __le32 bmSublinkSpeedAttr[1];
+  union {
+    __le32 legacy_padding;
+    __DECLARE_FLEX_ARRAY(__le32, bmSublinkSpeedAttr);
+  };
 #define USB_SSP_SUBLINK_SPEED_SSID (0xf)
 #define USB_SSP_SUBLINK_SPEED_LSE (0x3 << 4)
 #define USB_SSP_SUBLINK_SPEED_LSE_BPS 0