--- old/src/share/vm/gc/g1/sparsePRT.cpp	2017-07-02 11:30:42.000000000 +0200
+++ new/src/share/vm/gc/g1/sparsePRT.cpp	2017-07-02 11:30:42.000000000 +0200
@@ -120,8 +120,8 @@
                 "_capacity too large");
 
   // This will put -1 == NullEntry in the key field of all entries.
-  memset(_entries, NullEntry, _num_entries * SparsePRTEntry::size());
-  memset(_buckets, NullEntry, _capacity * sizeof(int));
+  memset((void*)_entries, NullEntry, _num_entries * SparsePRTEntry::size());
+  memset((void*)_buckets, NullEntry, _capacity * sizeof(int));
   _free_list = NullEntry;
   _free_region = 0;
 }