--- a/tools/profiler/tasktracer/GeckoTaskTracer.cpp
+++ b/tools/profiler/tasktracer/GeckoTaskTracer.cpp
@@ -256,17 +256,17 @@ GetOrCreateTraceInfo()
 }
 
 uint64_t
 GenNewUniqueTaskId()
 {
   TraceInfoHolder info = GetOrCreateTraceInfo();
   ENSURE_TRUE(info, 0);
 
-  Thread::tid_t tid = Thread::GetCurrentId();
+  int tid = Thread::GetCurrentId();
   uint64_t taskid = ((uint64_t)tid << 32) | ++info->mLastUniqueTaskId;
   return taskid;
 }
 
 AutoSaveCurTraceInfoImpl::AutoSaveCurTraceInfoImpl()
 {
   GetCurTraceInfo(&mSavedSourceEventId, &mSavedTaskId, &mSavedSourceEventType);
 }