diff --git a/src/main/java/org/elasticsearch/node/internal/InternalNode.java b/src/main/java/org/elasticsearch/node/internal/InternalNode.java
index 4ddf7a3faa9..c370e07d2f2 100644
--- a/src/main/java/org/elasticsearch/node/internal/InternalNode.java
+++ b/src/main/java/org/elasticsearch/node/internal/InternalNode.java
@@ -306,7 +306,10 @@ public final class InternalNode implements Node {
         return this;
     }
 
-    public void close() {
+    // During concurrent close() calls we want to make sure that all of them return after the node has completed it's shutdown cycle.
+    // If not, the hook that is added in Bootstrap#setup() will be useless: close() might not be executed, in case another (for example api) call
+    // to close() has already set some lifecycles to stopped. In this case the process will be terminated even if the first call to close() has not finished yet.
+    public synchronized void close() {
         if (lifecycle.started()) {
             stop();
         }