--- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp	Mon Nov 25 12:30:24 2019 +0100
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp	Mon Nov 25 12:31:39 2019 +0100
@@ -49,7 +49,7 @@
 
 
 inline ShenandoahHeapRegion* ShenandoahRegionIterator::next() {
-  size_t new_index = Atomic::add((size_t) 1, &_index);
+  size_t new_index = Atomic::add(&_index, (size_t) 1);
   // get_region() provides the bounds-check and returns NULL on OOB.
   return _heap->get_region(new_index - 1);
 }