--- old/src/share/vm/code/codeCache.cpp	2015-04-28 11:53:32.366968235 +0200
+++ new/src/share/vm/code/codeCache.cpp	2015-04-28 11:53:32.270964106 +0200
@@ -1371,10 +1371,10 @@
         if (cb->is_alive()) {
           number_of_blobs++;
           code_size += cb->code_size();
-          OopMapSet* set = cb->oop_maps();
+          ImmutableOopMapSet* set = cb->oop_maps();
           if (set != NULL) {
-            number_of_oop_maps += set->size();
-            map_size           += set->heap_size();
+            number_of_oop_maps += set->count();
+            map_size           += set->size();
           }
         }
       }