--- a/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp	Mon Nov 25 12:30:24 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp	Mon Nov 25 12:31:39 2019 +0100
@@ -223,7 +223,7 @@
   }
 
   intptr_t tax = MAX2<intptr_t>(1, words * Atomic::load(&_tax_rate));
-  Atomic::add(tax, &_budget);
+  Atomic::add(&_budget, tax);
 }
 
 intptr_t ShenandoahPacer::epoch() {