diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/NoUniqueBeanDefinitionException.java b/spring-beans/src/main/java/org/springframework/beans/factory/NoUniqueBeanDefinitionException.java
index 5744a73b1b0..9e30f2f72c5 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/NoUniqueBeanDefinitionException.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/NoUniqueBeanDefinitionException.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.beans.factory;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 
@@ -61,7 +62,7 @@ public class NoUniqueBeanDefinitionException extends NoSuchBeanDefinitionExcepti
 		super(type, "expected single matching bean but found " + beanNamesFound.size() + ": " +
 				StringUtils.collectionToCommaDelimitedString(beanNamesFound));
 		this.numberOfBeansFound = beanNamesFound.size();
-		this.beanNamesFound = beanNamesFound;
+		this.beanNamesFound = new ArrayList<>(beanNamesFound);
 	}
 
 	/**
@@ -83,7 +84,7 @@ public class NoUniqueBeanDefinitionException extends NoSuchBeanDefinitionExcepti
 		super(type, "expected single matching bean but found " + beanNamesFound.size() + ": " +
 				StringUtils.collectionToCommaDelimitedString(beanNamesFound));
 		this.numberOfBeansFound = beanNamesFound.size();
-		this.beanNamesFound = beanNamesFound;
+		this.beanNamesFound = new ArrayList<>(beanNamesFound);
 	}
 
 	/**