diff --git a/js/src/vm/HelperThreads.h b/js/src/vm/HelperThreads.h
index d9412ea8c9..b20b0a007b 100644
--- a/js/src/vm/HelperThreads.h
+++ b/js/src/vm/HelperThreads.h
@@ -562,7 +562,6 @@ class MOZ_RAII AutoUnlockHelperThreadState : public UnlockGuard<Mutex>
 struct ParseTask
 {
     ParseTaskKind kind;
-    ExclusiveContext* cx;
     JS::OwningCompileOptions options;
     // Anonymous union, the only correct interpretation is provided by the
     // ParseTaskKind value, or from the virtual parse function.