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 1a6c8d51d5..b37527b242 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
@@ -104,7 +104,7 @@ public class DefaultMavenProjectBuilder
 
     private static final String MAVEN_MODEL_VERSION = "4.0.0";
 
-    private HashMap<String, MavenProject> hm = new HashMap<String, MavenProject>();    
+    private static HashMap<String, MavenProject> hm = new HashMap<String, MavenProject>();    
     
     public void initialize()
     {