--- old/src/hotspot/share/utilities/ticks.inline.hpp	2018-04-13 11:50:52.771872439 +0200
+++ new/src/hotspot/share/utilities/ticks.inline.hpp	2018-04-13 11:50:52.496864011 +0200
@@ -32,6 +32,11 @@
   return lhs;
 }
 
+inline Tickspan operator-(Tickspan lhs, Tickspan rhs) {
+  lhs += rhs;
+  return lhs;
+}
+
 inline bool operator==(const Tickspan& lhs, const Tickspan& rhs) {
   return lhs.value() == rhs.value();
 }