--- old/src/share/vm/gc/cms/compactibleFreeListSpace.cpp	2016-03-21 15:28:35.529641533 -0700
+++ new/src/share/vm/gc/cms/compactibleFreeListSpace.cpp	2016-03-21 15:28:35.373641539 -0700
@@ -2525,6 +2525,8 @@
 }
 
 void CompactibleFreeListSpaceLAB::compute_desired_plab_size() {
+  const double num_refills = (double)CMSOldPLABNumRefills;
+
   for (size_t i =  CompactibleFreeListSpace::IndexSetStart;
        i < CompactibleFreeListSpace::IndexSetSize;
        i += CompactibleFreeListSpace::IndexSetStride) {
@@ -2536,7 +2538,7 @@
         _blocks_to_claim[i].sample(
           MAX2(CMSOldPLABMin,
           MIN2(CMSOldPLABMax,
-               _global_num_blocks[i]/(_global_num_workers[i]*CMSOldPLABNumRefills))));
+               (size_t)(_global_num_blocks[i]/(_global_num_workers[i]*num_refills)))));
       }
       // Reset counters for next round
       _global_num_workers[i] = 0;