diff --git a/xwords4/common/util.h b/xwords4/common/util.h
index 25ca1558e..bd6571fe7 100644
--- a/xwords4/common/util.h
+++ b/xwords4/common/util.h
@@ -133,7 +133,8 @@ typedef struct UtilVtable {
     XP_Bool (*m_util_warnIllegalWord)( XW_UtilCtxt* uc, BadWordInfo* bwi, 
                                        XP_U16 turn, XP_Bool turnLost );
 #ifdef BEYOND_IR
-    void (*m_util_addrChange)( XW_UtilCtxt* uc, const CommsAddrRec* aAddr );
+    void (*m_util_addrChange)( XW_UtilCtxt* uc, const CommsAddrRec* oldAddr,
+                               const CommsAddrRec* newAddr );
 #endif
 
 #ifdef XWFEATURE_SEARCHLIMIT
@@ -211,8 +212,8 @@ struct XW_UtilCtxt {
          (uc)->vtable->m_util_warnIllegalWord((uc),(w),(p),(b))
 
 #ifdef BEYOND_IR
-#define util_addrChange( uc, addr ) \
-         (uc)->vtable->m_util_addrChange((uc), (addr))
+#define util_addrChange( uc, addro, addrn ) \
+         (uc)->vtable->m_util_addrChange((uc), (addro), (addrn))
 #endif
 
 #ifdef XWFEATURE_SEARCHLIMIT