diff --git a/js/src/lirasm/lirasm.cpp b/js/src/lirasm/lirasm.cpp
index bc42a711552..94c9aed25d5 100644
--- a/js/src/lirasm/lirasm.cpp
+++ b/js/src/lirasm/lirasm.cpp
@@ -490,7 +490,6 @@ FragmentAssembler::FragmentAssembler(Lirasm &parent, const string &fragmentName)
                                                   nanojit::LC_FragProfile) ?
                                                   sProfId++ : 0));
     mFragment->lirbuf = mParent.mLirbuf;
-    mFragment->root = mFragment;
     mParent.mFragments[mFragName].fragptr = mFragment;
 
     mLir = mBufWriter  = new LirBufWriter(mParent.mLirbuf);
diff --git a/js/src/nanojit/Fragmento.cpp b/js/src/nanojit/Fragmento.cpp
index 68dd641dffa..6bf35cfcfd7 100644
--- a/js/src/nanojit/Fragmento.cpp
+++ b/js/src/nanojit/Fragmento.cpp
@@ -53,13 +53,11 @@ namespace nanojit
     Fragment::Fragment(const void* _ip
                        verbose_only(, uint32_t profFragID))
         :
-          root(NULL),
           lirbuf(NULL),
           lastIns(NULL),
           ip(_ip),
           recordAttempts(0),
           fragEntry(NULL),
-          vmprivate(NULL),
           verbose_only( loopLabel(NULL), )
           verbose_only( profFragID(profFragID), )
           verbose_only( profCount(0), )
diff --git a/js/src/nanojit/Fragmento.h b/js/src/nanojit/Fragmento.h
index d5f137f353b..f4bbe7a3772 100644
--- a/js/src/nanojit/Fragmento.h
+++ b/js/src/nanojit/Fragmento.h
@@ -63,16 +63,13 @@ namespace nanojit
             NIns*           code()                          { return _code; }
             void            setCode(NIns* codee)            { _code = codee; }
             int32_t&        hits()                          { return _hits; }
-            bool            isRoot() { return root == this; }
 
-            Fragment*      root;
             LirBuffer*     lirbuf;
             LIns*          lastIns;
 
             const void* ip;
             uint32_t recordAttempts;
             NIns* fragEntry;
-            void* vmprivate;
 
             // for fragment entry and exit profiling.  See detailed
             // how-to-use comment below.