diff --git a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
index b9e06d0a711..838e3b000e0 100644
--- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
@@ -572,7 +572,7 @@ public:
   // Returns true if the heap was expanded by the requested amount;
   // false otherwise.
   // (Rounds up to a G1HeapRegion boundary.)
-  bool expand(size_t expand_bytes, WorkerThreads* pretouch_workers = nullptr, double* expand_time_ms = nullptr);
+  bool expand(size_t expand_bytes, WorkerThreads* pretouch_workers, double* expand_time_ms = nullptr);
   bool expand_single_region(uint node_index);
 
   // Returns the PLAB statistics for a given destination.