--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -4213,16 +4213,22 @@ PresShell::DoFlushPendingNotifications(m
 
       if (aFlush.mFlushAnimations && mPresContext->EffectCompositor()) {
         mPresContext->EffectCompositor()->PostRestyleForThrottledAnimations();
       }
 
       // The FlushResampleRequests() above flushed style changes.
       if (!mIsDestroying) {
         nsAutoScriptBlocker scriptBlocker;
+#ifdef MOZ_GECKO_PROFILER
+        AutoProfilerTracing tracingStyleFlush("Paint", "Styles",
+                                              Move(mStyleCause));
+        mStyleCause = nullptr;
+#endif
+
         mPresContext->RestyleManager()->ProcessPendingRestyles();
       }
     }
 
     // Process whatever XBL constructors those restyles queued up.  This
     // ensures that onload doesn't fire too early and that we won't do extra
     // reflows after those constructors run.
     if (!mIsDestroying) {