diff --git a/phases/ephemeral/witx/typenames.witx b/phases/ephemeral/witx/typenames.witx
index 9c98fa79..d1f833c2 100644
--- a/phases/ephemeral/witx/typenames.witx
+++ b/phases/ephemeral/witx/typenames.witx
@@ -552,8 +552,6 @@
 ;; The contents of a $subscription_t when type is `EVENTTYPE_CLOCK`.
 (typename $subscription_clock_t
   (struct
-    ;; The user-defined unique identifier of the clock.
-    (field $identifier $userdata_t)
     ;; The clock against which to compare the timestamp.
     (field $clock_id $clockid_t)
     ;; The absolute or relative timestamp.