diff --git a/C/cdmgr.c b/C/cdmgr.c
index 7923fb4e5..c193f1361 100644
--- a/C/cdmgr.c
+++ b/C/cdmgr.c
@@ -709,13 +709,10 @@ assertz_dynam_clause(PredEntry *p, CODEADDR cp)
 
 static void  expand_consult(void)
 {
-  consult_obj *new_cl, *new_cb, *new_cs, *old_top;
-  UInt old_sz = ConsultCapacity-1, i;
-  Int diff;
-  
+  consult_obj *new_cl, *new_cb, *new_cs;
+  UInt OldConsultCapacity = ConsultCapacity;
 
-  old_top = ConsultBase+ConsultCapacity;
-  /* now increment consult capacity */
+  /* now double consult capacity */
   ConsultCapacity += InitialConsultCapacity;
   /* I assume it always works ;-) */
   new_cl = (consult_obj *)AllocCodeSpace(sizeof(consult_obj)*ConsultCapacity);
@@ -723,21 +720,16 @@ static void  expand_consult(void)
     Error(SYSTEM_ERROR,TermNil,"Could not expand consult space: Heap crashed against Stacks");
     return;
   }
-  new_cb = new_cl + (ConsultSp-ConsultBase);
   new_cs = new_cl + (InitialConsultCapacity+1);
+  new_cb = new_cs + (ConsultBase-ConsultSp);
   /* start copying */
-  memcpy((void *)(new_cs), (void *)(ConsultSp), (ConsultCapacity-(InitialConsultCapacity+1))*sizeof(consult_obj));
+  memcpy((void *)(new_cs), (void *)(ConsultSp), OldConsultCapacity*sizeof(consult_obj));
   /* copying done, release old space */
   FreeCodeSpace((char *)ConsultLow);
   /* next, set up pointers correctly */
-  diff = (char *)new_cb-(char *)ConsultBase;
   ConsultSp = new_cs;
   ConsultBase = new_cb;
   ConsultLow = new_cl;
-  /* adjust consultbase pointers */
-  for (i = 0; i < old_sz; i++) {
-    new_cs->c = (consult_obj *)((void *)(new_cs->c)+diff);
-  }
 }
 
 /* p was already locked */
@@ -1127,7 +1119,7 @@ init_consult(int mode, char *file)
   ConsultSp--;
   ConsultSp->mode = mode;
   ConsultSp--;
-  ConsultSp->c = ConsultBase;
+  ConsultSp->c = (ConsultBase-ConsultSp);
   ConsultBase = ConsultSp;
 #if !defined(YAPOR) && !defined(SBA)
   if (consult_level == 0)
@@ -1178,7 +1170,8 @@ end_consult(void)
   }
 #endif
   ConsultSp = ConsultBase;
-  ConsultBase = ConsultSp->c;
+  printf("ConsultBase is %p\n",ConsultBase);
+  ConsultBase = ConsultSp+ConsultSp->c;
   ConsultSp += 3;
   consult_level--;
 #if !defined(YAPOR) && !defined(SBA)
diff --git a/C/heapgc.c b/C/heapgc.c
index 245f00a84..705b39354 100644
--- a/C/heapgc.c
+++ b/C/heapgc.c
@@ -572,7 +572,7 @@ init_dbtable(tr_fr_ptr trail_ptr) {
 #ifdef DEBUG
 
 #define INSTRUMENT_GC 1
-/* #define CHECK_CHOICEPOINTS 1  */
+#define CHECK_CHOICEPOINTS 1  
 
 #ifdef INSTRUMENT_GC
 typedef enum {
diff --git a/H/Heap.h b/H/Heap.h
index dbf0ee55c..bed864456 100644
--- a/H/Heap.h
+++ b/H/Heap.h
@@ -10,7 +10,7 @@
 * File:		Heap.h         						 *
 * mods:									 *
 * comments:	Heap Init Structure					 *
-* version:      $Id: Heap.h,v 1.15 2001-12-17 18:31:10 vsc Exp $	 *
+* version:      $Id: Heap.h,v 1.16 2002-01-01 05:26:25 vsc Exp $	 *
 *************************************************************************/
 
 /* information that can be stored in Code Space */
@@ -80,10 +80,10 @@ typedef struct various_codes {
     CODEADDR clause;
     Functor func;
   } clausecode;
-  consult_obj *consultsp;
-  consult_obj *consultbase;
-  consult_obj *consultlow;
-  Int   consultcapacity;
+  union CONSULT_OBJ *consultsp;
+  union CONSULT_OBJ *consultbase;
+  union CONSULT_OBJ *consultlow;
+  UInt   consultcapacity;
 #if HAVE_LIBREADLINE
   char *readline_buf, *readline_pos;
 #endif
diff --git a/H/clause.h b/H/clause.h
index 5f2a25cc6..9beb5cb06 100644
--- a/H/clause.h
+++ b/H/clause.h
@@ -18,6 +18,15 @@
 #include "Yatom.h"
 #include "Heap.h"
 
+/* consulting files */
+
+typedef union CONSULT_OBJ {
+  char *filename;
+  int mode;
+  Prop  p;
+  UInt c;
+} consult_obj;
+
 /* Either we are assembling clauses or indexing code */
 
 #define ASSEMBLING_CLAUSE	0
diff --git a/H/compile.h b/H/compile.h
index 09a5ae9b1..ec6bdd942 100644
--- a/H/compile.h
+++ b/H/compile.h
@@ -15,6 +15,8 @@
 *									 *
 *************************************************************************/
 
+/* consult stack management */
+
 /* virtual machine instruction op-codes					*/
 typedef enum compiler_op {
   nop_op,
diff --git a/m4/Yap.h.m4 b/m4/Yap.h.m4
index da2fd6bef..0106e7515 100644
--- a/m4/Yap.h.m4
+++ b/m4/Yap.h.m4
@@ -10,7 +10,7 @@
 * File:		Yap.h.m4						 *
 * mods:									 *
 * comments:	main header file for YAP				 *
-* version:      $Id: Yap.h.m4,v 1.15 2001-12-20 17:19:43 vsc Exp $	 *
+* version:      $Id: Yap.h.m4,v 1.16 2002-01-01 05:26:25 vsc Exp $	 *
 *************************************************************************/
 
 #include "config.h"
@@ -733,15 +733,6 @@ extern int      emacs_mode;
 /************ variable concerned with version number *****************/
 extern char    version_number[];
 
-/* consult stack management */
-
-typedef union CONSULT_OBJ {
-  char *filename;
-  int mode;
-  Prop  p;
-  union CONSULT_OBJ *c;
-} consult_obj;
-
 /********* common instructions codes*************************/
 
 #define MAX_PROMPT  256
diff --git a/m4/sshift.h.m4 b/m4/sshift.h.m4
index c443ab9fd..b2a396d3e 100644
--- a/m4/sshift.h.m4
+++ b/m4/sshift.h.m4
@@ -77,7 +77,7 @@ Inline(BlobTermAdjust, Term, Term, t, (t-HDiff) )
 Inline(BlobTermAdjust, Term, Term, t, (t+HDiff) )
 #endif
 Inline(AtomEntryAdjust, AtomEntry *, AtomEntry *, at, (AtomEntry *)(CharP(at)+HDiff) )
-Inline(ConsultObjAdjust, consult_obj *, consult_obj *, co, (consult_obj *)(CharP(co)+HDiff) )
+Inline(ConsultObjAdjust, union CONSULT_OBJ *, union CONSULT_OBJ *, co, (union CONSULT_OBJ *)(CharP(co)+HDiff) )
 Inline(DBRefAdjust, DBRef, DBRef, dbr, (DBRef)(CharP(dbr)+HDiff) )
 Inline(CodeAdjust, Term, Term, dbr, ((Term)(dbr)+HDiff) )
 Inline(AddrAdjust, ADDR, ADDR, addr, (ADDR)(CharP(addr)+HDiff) )