diff --git a/mps/code/zcoll.c b/mps/code/zcoll.c
index 2f8962e70df..ec6149d6332 100644
--- a/mps/code/zcoll.c
+++ b/mps/code/zcoll.c
@@ -432,15 +432,7 @@ static void BigdropSmall(mps_arena_t arena, mps_ap_t ap, size_t big, char small)
   
   mps_arena_park(arena);
   for(i = 0; i < 100; i++) {
-    /* Hack to demonstrate pRLr in AMCTraceEnd_pageret diag:
-     * Make ambig ref to bigLimit, which for large segs will point to 
-     * the LSP-pad.  This will make pRLr (pages of Large segs retained 
-     * by a rest-obj ref) non-zero.
-     * With this hack, pRLr in AMCTraceEnd_pageret does indeed do this.
-     */
-    char *bigLimit = MakeThing(arena, ap, big);
-    bigLimit += big;
-    myrootAmbig[keepCount++ % myrootAmbigCOUNT] = bigLimit;
+    (void) MakeThing(arena, ap, big);
     if(small == 'A') {
       myrootAmbig[keepCount++ % myrootAmbigCOUNT] = MakeThing(arena, ap, 1);
     } else if(small == 'E') {