diff --git a/510_Deployment/50_heap.asciidoc b/510_Deployment/50_heap.asciidoc
index 976a86e2c..cb4c7aa40 100644
--- a/510_Deployment/50_heap.asciidoc
+++ b/510_Deployment/50_heap.asciidoc
@@ -219,5 +219,5 @@ Finally, if neither approach is possible, you should enable `mlockall`. file.
 
 [source,yaml]
 ----
-bootstrap.mlockall: true
+bootstrap.memory_lock: true
 ----