diff --git a/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java b/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
index c1157e940a..a1098936cd 100644
--- a/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
+++ b/maven-project/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java
@@ -292,7 +292,7 @@ public class DefaultMavenProjectBuilder
         }
         else
         {
-            aggregatedRemoteWagonRepositories = remoteArtifactRepositories;
+            aggregatedRemoteWagonRepositories = new ArrayList( remoteArtifactRepositories );
         }
 
         for ( Iterator i = externalProfiles.iterator(); i.hasNext(); )