diff --git a/src/cpu/thread_state.cc b/src/cpu/thread_state.cc
index a142f57..5e59eb2 100644
--- a/src/cpu/thread_state.cc
+++ b/src/cpu/thread_state.cc
@@ -39,7 +39,7 @@
 #include "sim/system.hh"
 
 ThreadState::ThreadState(BaseCPU *cpu, ThreadID _tid, Process *_process)
-    : numInst(0), numOp(0), threadStats(cpu, this),
+    : numInst(0), numOp(0), threadStats(cpu, _tid),
       numLoad(0), startNumLoad(0),
       _status(ThreadContext::Halted), baseCpu(cpu),
       _contextId(0), _threadId(_tid), lastActivate(0), lastSuspend(0),
@@ -119,8 +119,8 @@
 }
 
 ThreadState::ThreadStateStats::ThreadStateStats(BaseCPU *cpu,
-                                                ThreadState *thread)
-      : Stats::Group(cpu, csprintf("thread%i", thread->threadId()).c_str()),
+                                                const ThreadID& tid)
+      : Stats::Group(cpu, csprintf("thread_%i", tid).c_str()),
       ADD_STAT(numInsts, "Number of Instructions committed"),
       ADD_STAT(numOps, "Number of Ops committed"),
       ADD_STAT(numMemRefs, "Number of Memory References")
diff --git a/src/cpu/thread_state.hh b/src/cpu/thread_state.hh
index 3ac473d..53817c8 100644
--- a/src/cpu/thread_state.hh
+++ b/src/cpu/thread_state.hh
@@ -111,7 +111,7 @@
     // Defining the stat group
     struct ThreadStateStats : public Stats::Group
     {
-        ThreadStateStats(BaseCPU *cpu, ThreadState *thread);
+        ThreadStateStats(BaseCPU *cpu, const ThreadID& thread);
         /** Stat for number instructions committed. */
         Stats::Scalar numInsts;
         /** Stat for number ops (including micro ops) committed. */