diff --git a/src/hotspot/share/gc/g1/heapRegion.hpp b/src/hotspot/share/gc/g1/heapRegion.hpp
index 78216d0b773..ffd7de53f66 100644
--- a/src/hotspot/share/gc/g1/heapRegion.hpp
+++ b/src/hotspot/share/gc/g1/heapRegion.hpp
@@ -130,8 +130,6 @@ private:
 
   void clear(bool mangle_space);
 
-  HeapWord* block_start_const(const void* p) const;
-
   void mangle_unused_area() PRODUCT_RETURN;
 
   // Try to allocate at least min_word_size and up to desired_size from this region.