--- a/src/hotspot/share/gc/z/zMarkTerminate.inline.hpp	Mon Nov 25 12:30:24 2019 +0100
+++ b/src/hotspot/share/gc/z/zMarkTerminate.inline.hpp	Mon Nov 25 12:31:39 2019 +0100
@@ -37,7 +37,7 @@
 }
 
 inline void ZMarkTerminate::exit_stage(volatile uint* nworking_stage) {
-  Atomic::add(1u, nworking_stage);
+  Atomic::add(nworking_stage, 1u);
 }
 
 inline bool ZMarkTerminate::try_exit_stage(volatile uint* nworking_stage) {