diff -r 7939b3c4e408 -r c25572739e7c src/hotspot/share/gc/g1/g1BlockOffsetTable.cpp
--- a/src/hotspot/share/gc/g1/g1BlockOffsetTable.cpp	Wed Aug 08 10:21:23 2018 +0800
+++ b/src/hotspot/share/gc/g1/g1BlockOffsetTable.cpp	Wed Aug 08 15:31:06 2018 +0200
@@ -75,12 +75,12 @@
 //////////////////////////////////////////////////////////////////////
 
 G1BlockOffsetTablePart::G1BlockOffsetTablePart(G1BlockOffsetTable* array, G1ContiguousSpace* gsp) :
+  _next_offset_threshold(NULL),
+  _next_offset_index(0),
+  DEBUG_ONLY(_object_can_span(false) COMMA)
   _bot(array),
-  _space(gsp),
-  _next_offset_threshold(NULL),
-  _next_offset_index(0)
+  _space(gsp)
 {
-  debug_only(_object_can_span = false;)
 }
 
 // The arguments follow the normal convention of denoting