diff --git a/src/backend/access/brin/brin_pageops.c b/src/backend/access/brin/brin_pageops.c
index 80f803e..b0f86f3 100644
*** a/src/backend/access/brin/brin_pageops.c
--- b/src/backend/access/brin/brin_pageops.c
*************** brin_doupdate(Relation idxrel, BlockNumb
*** 113,121 ****
  
  	/*
  	 * Check that the old tuple wasn't updated concurrently: it might have
! 	 * moved someplace else entirely ...
  	 */
! 	if (!ItemIdIsNormal(oldlp))
  	{
  		LockBuffer(oldbuf, BUFFER_LOCK_UNLOCK);
  
--- 113,127 ----
  
  	/*
  	 * Check that the old tuple wasn't updated concurrently: it might have
! 	 * moved someplace else entirely, and for that matter the whole page
! 	 * might've become a revmap page.  Note that in the first two cases
! 	 * checked here, the "oldlp" we just calculated is garbage; but
! 	 * PageGetItemId() is simple enough that it was safe to do that
! 	 * calculation anyway.
  	 */
! 	if (!BRIN_IS_REGULAR_PAGE(oldpage) ||
! 		oldoff > PageGetMaxOffsetNumber(oldpage) ||
! 		!ItemIdIsNormal(oldlp))
  	{
  		LockBuffer(oldbuf, BUFFER_LOCK_UNLOCK);