Fix count of compacting update tasks started.

1 files changed, 1 insertions, 1 deletions

diff --git a/js/src/jsgc.cpp b/js/src/jsgc.cpp
index 45301dac87..fb10797d51 100644
--- a/js/src/jsgc.cpp
+++ b/js/src/jsgc.cpp
@@ -2276,7 +2276,7 @@ GCRuntime::updateCellPointers(MovingTracer* trc, Zone* zone, AllocKinds kinds, s
         for (size_t i = 0; i < bgTaskCount && !bgArenas.done(); i++) {
             bgTasks[i].emplace(rt, &bgArenas, lock);
             startTask(*bgTasks[i], gcstats::PHASE_COMPACT_UPDATE_CELLS, lock);
-            tasksStarted = i;
+            tasksStarted++;
         }
     }