diff --git a/src/backend/access/nbtree/nbtinsert.c b/src/backend/access/nbtree/nbtinsert.c
index 0a7414869309120b616ba6067116333e82f8dcb9..a743da1cc444d1e65ac00f5eb023a9371c47b07e 100644
--- a/src/backend/access/nbtree/nbtinsert.c
+++ b/src/backend/access/nbtree/nbtinsert.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.148 2007/01/27 20:53:30 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.149 2007/02/06 14:55:11 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -855,22 +855,17 @@ _bt_split(Relation rel, Buffer buf, OffsetNumber firstright,
 	/* cope with possibility that newitem goes at the end */
 	if (i <= newitemoff)
 	{
-		if (newitemonleft)
-		{
-			_bt_pgaddtup(rel, leftpage, newitemsz, newitem, leftoff,
-						 "left sibling");
-			itup_off = leftoff;
-			itup_blkno = BufferGetBlockNumber(buf);
-			leftoff = OffsetNumberNext(leftoff);
-		}
-		else
-		{
-			_bt_pgaddtup(rel, rightpage, newitemsz, newitem, rightoff,
-						 "right sibling");
-			itup_off = rightoff;
-			itup_blkno = BufferGetBlockNumber(rbuf);
-			rightoff = OffsetNumberNext(rightoff);
-		}
+		/*
+		 * Can't have newitemonleft here; that would imply we were told to put
+		 * *everything* on the left page, which cannot fit (if it could, we'd
+		 * not be splitting the page).
+		 */
+		Assert(!newitemonleft);
+		_bt_pgaddtup(rel, rightpage, newitemsz, newitem, rightoff,
+					 "right sibling");
+		itup_off = rightoff;
+		itup_blkno = BufferGetBlockNumber(rbuf);
+		rightoff = OffsetNumberNext(rightoff);
 	}
 
 	/*