--- old/src/hotspot/share/jfr/recorder/repository/jfrChunkWriter.cpp	2018-09-25 19:23:49.000000000 +0300
+++ new/src/hotspot/share/jfr/recorder/repository/jfrChunkWriter.cpp	2018-09-25 19:23:49.000000000 +0300
@@ -89,11 +89,11 @@
 void JfrChunkWriter::write_header(intptr_t metadata_offset) {
   assert(this->is_valid(), "invariant");
   // Chunk size
-  this->write_be_at_offset(size_written(), CHUNK_SIZE_OFFSET);
+  this->write_be_at_offset((jlong)size_written(), CHUNK_SIZE_OFFSET);
   // initial checkpoint event offset
   this->write_be_at_offset(_chunkstate->previous_checkpoint_offset(), CHUNK_SIZE_OFFSET + (1 * FILEHEADER_SLOT_SIZE));
   // metadata event offset
-  this->write_be_at_offset(metadata_offset, CHUNK_SIZE_OFFSET + (2 * FILEHEADER_SLOT_SIZE));
+  this->write_be_at_offset((jlong)metadata_offset, CHUNK_SIZE_OFFSET + (2 * FILEHEADER_SLOT_SIZE));
   // start of chunk in nanos since epoch
   this->write_be_at_offset(_chunkstate->previous_start_nanos(), CHUNK_SIZE_OFFSET + (3 * FILEHEADER_SLOT_SIZE));
   // duration of chunk in nanos