diff --git a/src/hotspot/share/gc/shared/gcThreadLocalData.hpp b/src/hotspot/share/gc/shared/gcThreadLocalData.hpp
index 7599a7f..1c377f9 100644
--- a/src/hotspot/share/gc/shared/gcThreadLocalData.hpp
+++ b/src/hotspot/share/gc/shared/gcThreadLocalData.hpp
@@ -40,6 +40,6 @@
 // should consider placing frequently accessed fields first in
 // T, so that field offsets relative to Thread are small, which
 // often allows for a more compact instruction encoding.
-typedef uint64_t GCThreadLocalData[18]; // 144 bytes
+typedef uint64_t GCThreadLocalData[19]; // 144 bytes
 
 #endif // SHARE_GC_SHARED_GCTHREADLOCALDATA_HPP