--- a/js/src/gc/Sweeping.cpp
+++ b/js/src/gc/Sweeping.cpp
@@ -1192,17 +1192,18 @@ void GCRuntime::updateAtomsBitmap() {
     // refineZoneBitmapForCollectedZone call can only remove atoms from the
     // zone bitmap, so it is conservative to just not call it.
   }
 
   atomMarking.markAtomsUsedByUncollectedZones(rt);
 
   // For convenience sweep these tables non-incrementally as part of bitmap
   // sweeping; they are likely to be much smaller than the main atoms table.
-  rt->symbolRegistry().sweep();
+  SweepingTracer trc(rt);
+  rt->symbolRegistry().traceWeak(&trc);
 }
 
 void GCRuntime::sweepCCWrappers() {
   AutoSetThreadIsSweeping threadIsSweeping;  // This can touch all zones.
   for (SweepGroupZonesIter zone(this); !zone.done(); zone.next()) {
     zone->sweepAllCrossCompartmentWrappers();
   }
 }