--- a/src/hotspot/share/gc/z/zBitMap.inline.hpp	Mon Nov 25 12:32:40 2019 +0100
+++ b/src/hotspot/share/gc/z/zBitMap.inline.hpp	Mon Nov 25 12:33:15 2019 +0100
@@ -55,7 +55,7 @@
       inc_live = false;
       return false;
     }
-    const bm_word_t cur_val = Atomic::cmpxchg(new_val, addr, old_val);
+    const bm_word_t cur_val = Atomic::cmpxchg(addr, old_val, new_val);
     if (cur_val == old_val) {
       // Success
       const bm_word_t marked_mask = bit_mask(bit);