diff --git a/os/pl-privitf.c b/os/pl-privitf.c
index 91d664d94..d48d422f2 100644
--- a/os/pl-privitf.c
+++ b/os/pl-privitf.c
@@ -19,7 +19,7 @@
 
     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
 #include "pl-incl.h"
@@ -173,7 +173,7 @@ unifyList(term_t term, list_ctx *ctx)
 
   a = valTermRef(term);
   deRef(a);
-  if ( !unify_ptrs(a, ctx->lp PASS_LD) )
+  if ( !unify_ptrs(a, ctx->lp, 0 PASS_LD) )
   { gTop = ctx->lp;
     return FALSE;
   }
@@ -191,13 +191,13 @@ unifyDiffList(term_t head, term_t tail, list_ctx *ctx)
 
   a = valTermRef(head);
   deRef(a);
-  if ( !unify_ptrs(a, ctx->lp PASS_LD) )
+  if ( !unify_ptrs(a, ctx->lp, 0 PASS_LD) )
   { gTop = ctx->lp;
     return FALSE;
   }
   a = valTermRef(tail);
   deRef(a);
-  if ( !unify_ptrs(a, ctx->gstore PASS_LD) )
+  if ( !unify_ptrs(a, ctx->gstore, 0 PASS_LD) )
   { gTop = ctx->lp;
     return FALSE;
   }