diff --git a/src/hotspot/share/gc/parallel/psScavenge.hpp b/src/hotspot/share/gc/parallel/psScavenge.hpp
index 69fa18aa0bec7..0c61bc9c30e1e 100644
--- a/src/hotspot/share/gc/parallel/psScavenge.hpp
+++ b/src/hotspot/share/gc/parallel/psScavenge.hpp
@@ -33,12 +33,10 @@
 #include "oops/oop.hpp"
 #include "utilities/stack.hpp"
 
-class OopStack;
 class ReferenceProcessor;
 class ParallelScavengeHeap;
 class ParallelScavengeTracer;
 class PSIsAliveClosure;
-class PSRefProcTaskExecutor;
 class STWGCTimer;
 
 class PSScavenge: AllStatic {