--- old/src/hotspot/share/utilities/ticks.inline.hpp	2018-04-16 13:05:23.344649683 +0200
+++ new/src/hotspot/share/utilities/ticks.inline.hpp	2018-04-16 13:05:23.079641557 +0200
@@ -33,7 +33,7 @@
 }
 
 inline Tickspan operator-(Tickspan lhs, Tickspan rhs) {
-  lhs += rhs;
+  lhs -= rhs;
   return lhs;
 }