--- a/tools/profiler/core/platform.cpp
+++ b/tools/profiler/core/platform.cpp
@@ -2411,17 +2411,17 @@ locked_profiler_start(PSLockRef aLock, i
   }
 
   // Dead ThreadInfos are deleted in profiler_stop(), and dead ThreadInfos
   // aren't saved when the profiler is inactive. Therefore the dead threads
   // vector should be empty here.
   MOZ_RELEASE_ASSERT(CorePS::DeadThreads(aLock).empty());
 
 #ifdef MOZ_TASK_TRACER
-  if (featureTaskTracer) {
+  if (ActivePS::FeatureTaskTracer(aLock)) {
     mozilla::tasktracer::StartLogging();
   }
 #endif
 
 #if defined(PROFILE_JAVA)
   if (ActivePS::FeatureJava(aLock)) {
     int javaInterval = interval;
     // Java sampling doesn't accurately keep up with 1ms sampling.