diff --git a/maven-core/src/main/java/org/apache/maven/listeners/BuildExtensionListener.java b/maven-core/src/main/java/org/apache/maven/listeners/BuildExtensionListener.java
index 3f87eab2a4..9e4ca83130 100644
--- a/maven-core/src/main/java/org/apache/maven/listeners/BuildExtensionListener.java
+++ b/maven-core/src/main/java/org/apache/maven/listeners/BuildExtensionListener.java
@@ -45,8 +45,8 @@ public class BuildExtensionListener
     
     private List<BuildExtension> buildExtensions = new ArrayList<BuildExtension>();
     
-    public void fire( List<ModelContainer> modelContainers )
-        throws DataSourceException
+    public void fire(List<? extends ModelContainer> modelContainers) 
+        throws DataSourceException     
     {        
         if ( !inBuild )
         {