diff --git a/maven-filtering/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java b/maven-filtering/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
index 77cbea576..2b7cdb8f9 100644
--- a/maven-filtering/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
+++ b/maven-filtering/src/main/java/org/apache/maven/shared/filtering/DefaultMavenFileFilter.java
@@ -211,7 +211,7 @@ public List getDefaultFilterWrappers( final AbstractMavenFilteringRequest req )
         {
             if ( request.isInjectProjectBuildFilters() )
             {
-                List buildFilters = request.getMavenProject().getBuild().getFilters();
+                List buildFilters = new ArrayList( request.getMavenProject().getBuild().getFilters() );
                 buildFilters.removeAll( request.getFileFilters() );
                 
                 loadProperties( filterProperties, buildFilters, baseProps );