diff --git a/src/hotspot/share/gc/shared/collectedHeap.hpp b/src/hotspot/share/gc/shared/collectedHeap.hpp
index b503d38c505..1562a4b43ad 100644
--- a/src/hotspot/share/gc/shared/collectedHeap.hpp
+++ b/src/hotspot/share/gc/shared/collectedHeap.hpp
@@ -46,9 +46,6 @@
 // class defines the functions that a heap must implement, and contains
 // infrastructure common to all heaps.
 
-class WorkerTask;
-class AdaptiveSizePolicy;
-class BarrierSet;
 class GCHeapLog;
 class GCHeapSummary;
 class GCTimer;