diff --git a/maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionResult.java b/maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionResult.java
index d3d63f9102..55e87cdeec 100644
--- a/maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionResult.java
+++ b/maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionResult.java
@@ -20,9 +20,9 @@
  */
 
 import java.util.Collections;
-import java.util.IdentityHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 
 import org.apache.maven.project.DependencyResolutionResult;
@@ -42,7 +42,7 @@ public class DefaultMavenExecutionResult
 
     private List<Throwable> exceptions = new CopyOnWriteArrayList<Throwable>();
 
-    private Map<MavenProject, BuildSummary> buildSummaries = Maps.newIdentityHashMap();
+    private Map<MavenProject, BuildSummary> buildSummaries = Maps.newConcurrentMap();
 
     public MavenExecutionResult setProject( MavenProject project )
     {
@@ -107,7 +107,7 @@ public void addBuildSummary( BuildSummary summary )
     {
         if ( buildSummaries == null )
         {
-            buildSummaries = new IdentityHashMap<MavenProject, BuildSummary>();
+            buildSummaries = new ConcurrentHashMap<MavenProject, BuildSummary>();
         }
         buildSummaries.put( summary.getProject(), summary );
     }