diff --git a/sys/dev/usb/quirk/usb_quirk.c b/sys/dev/usb/quirk/usb_quirk.c
index b8f07aa8d9d..b1f4d740ebb 100644
--- a/sys/dev/usb/quirk/usb_quirk.c
+++ b/sys/dev/usb/quirk/usb_quirk.c
@@ -799,7 +799,7 @@ usb_quirk_ioctl(unsigned long cmd, caddr_t data,
 		}
 		if (x == USB_SUB_QUIRKS_MAX) {
 			/* all quirk entries are unused - release */
-			memset(pqe, 0, sizeof(pqe));
+			memset(pqe, 0, sizeof(*pqe));
 		}
 		mtx_unlock(&usb_quirk_mtx);
 		return (0);		/* success */