--- a/src/hotspot/share/classfile/classLoaderDataGraph.inline.hpp	Mon Nov 25 12:31:39 2019 +0100
+++ b/src/hotspot/share/classfile/classLoaderDataGraph.inline.hpp	Mon Nov 25 12:32:07 2019 +0100
@@ -55,7 +55,7 @@
 
 void ClassLoaderDataGraph::dec_instance_classes(size_t count) {
   assert(count <= _num_instance_classes, "Sanity");
-  Atomic::sub(count, &_num_instance_classes);
+  Atomic::sub(&_num_instance_classes, count);
 }
 
 void ClassLoaderDataGraph::inc_array_classes(size_t count) {
@@ -64,7 +64,7 @@
 
 void ClassLoaderDataGraph::dec_array_classes(size_t count) {
   assert(count <= _num_array_classes, "Sanity");
-  Atomic::sub(count, &_num_array_classes);
+  Atomic::sub(&_num_array_classes, count);
 }
 
 bool ClassLoaderDataGraph::should_clean_metaspaces_and_reset() {