diff --git a/mps/code/mpm.h b/mps/code/mpm.h
index 01f1785e402..a20c2bbc89c 100644
--- a/mps/code/mpm.h
+++ b/mps/code/mpm.h
@@ -1,7 +1,7 @@
 /* mpm.h: MEMORY POOL MANAGER DEFINITIONS
  *
  * $Id$
- * Copyright (c) 2001-2016 Ravenbrook Limited.  See end of file for license.
+ * Copyright (c) 2001-2018 Ravenbrook Limited.  See end of file for license.
  * Portions copyright (C) 2002 Global Graphics Software.
  *
  * .trans.bufferinit: The Buffer data structure has an Init field and
@@ -487,7 +487,7 @@ extern void GlobalsReinitializeAll(void);
 #define ArenaGreyRing(arena, rank) (&(arena)->greyRing[rank])
 #define ArenaPoolRing(arena) (&ArenaGlobals(arena)->poolRing)
 #define ArenaChunkTree(arena) RVALUE((arena)->chunkTree)
-#define ArenaChunkRing(arena) RVALUE(&(arena)->chunkRing)
+#define ArenaChunkRing(arena)   (&(arena)->chunkRing)
 #define ArenaShield(arena)      (&(arena)->shieldStruct)
 #define ArenaHistory(arena)     (&(arena)->historyStruct)
 
@@ -692,7 +692,7 @@ extern Addr (SegLimit)(Seg seg);
 #define SegGrey(seg)            RVALUE((TraceSet)(seg)->grey)
 #define SegWhite(seg)           RVALUE((TraceSet)(seg)->white)
 #define SegNailed(seg)          RVALUE((TraceSet)(seg)->nailed)
-#define SegPoolRing(seg)        RVALUE(&(seg)->poolRing)
+#define SegPoolRing(seg)        (&(seg)->poolRing)
 #define SegOfPoolRing(node)     RING_ELT(Seg, poolRing, (node))
 #define SegOfGreyRing(node)     (&(RING_ELT(GCSeg, greyRing, (node)) \
                                    ->segStruct))
@@ -1008,7 +1008,7 @@ DECLARE_CLASS(Land, Land, Inst);
 
 /* C. COPYRIGHT AND LICENSE
  *
- * Copyright (C) 2001-2016 Ravenbrook Limited <http://www.ravenbrook.com/>.
+ * Copyright (C) 2001-2018 Ravenbrook Limited <http://www.ravenbrook.com/>.
  * All rights reserved.  This is an open source license.  Contact
  * Ravenbrook for commercial licensing options.
  * 
diff --git a/mps/code/tract.h b/mps/code/tract.h
index ce7c602a176..73322f2d9d3 100644
--- a/mps/code/tract.h
+++ b/mps/code/tract.h
@@ -1,7 +1,7 @@
 /* tract.h: PAGE TABLE INTERFACE
  *
  * $Id$
- * Copyright (c) 2001-2014 Ravenbrook Limited.  See end of file for license.
+ * Copyright (c) 2001-2018 Ravenbrook Limited.  See end of file for license.
  */
 
 
@@ -110,7 +110,7 @@ typedef union PageUnion {     /* page structure */
 #define PagePool(page)        RVALUE((page)->pool.pool)
 #define PageIsAllocated(page) RVALUE(PagePool(page) != NULL)
 #define PageState(page)       RVALUE((page)->pool.state)
-#define PageSpareRing(page)   RVALUE(&(page)->spare.spareRing)
+#define PageSpareRing(page)   (&(page)->spare.spareRing)
 #define PageOfSpareRing(node) PARENT(PageUnion, spare, RING_ELT(PageSpare, spareRing, node))
 
 #define PageSetPool(page, _pool) \
@@ -259,7 +259,7 @@ extern void PageFree(Chunk chunk, Index pi);
 
 /* C. COPYRIGHT AND LICENSE
  *
- * Copyright (C) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
+ * Copyright (C) 2001-2018 Ravenbrook Limited <http://www.ravenbrook.com/>.
  * All rights reserved.  This is an open source license.  Contact
  * Ravenbrook for commercial licensing options.
  *