diff --git a/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupContext.java b/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupContext.java
index c3bbb9815852..bf156b69498d 100644
--- a/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupContext.java
+++ b/impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupContext.java
@@ -105,7 +105,7 @@ public LookupContext(InvokerRequest invokerRequest, boolean containerCapsuleMana
     public Settings effectiveSettings;
     public PersistedToolchains effectiveToolchains;
 
-    public final List<AutoCloseable> closeables = new ArrayList<>();
+    public final List<AutoCloseable> closeables = Collections.synchronizedList(new ArrayList<>());
 
     @Override
     public void close() throws InvokerException {