diff --git a/querydsl-core/src/main/java/com/mysema/util/BeanMap.java b/querydsl-core/src/main/java/com/mysema/util/BeanMap.java
index e2e7ec318..b776ed933 100644
--- a/querydsl-core/src/main/java/com/mysema/util/BeanMap.java
+++ b/querydsl-core/src/main/java/com/mysema/util/BeanMap.java
@@ -52,9 +52,9 @@ public class BeanMap extends AbstractMap<String, Object> implements Cloneable {
 
     private transient Object bean;
 
-    private transient HashMap<String, Method> readMethods = new HashMap<String, Method>();
-    private transient HashMap<String, Method> writeMethods = new HashMap<String, Method>();
-    private transient HashMap<String, Class<?>> types = new HashMap<String, Class<?>>();
+    private transient Map<String, Method> readMethods = new HashMap<String, Method>();
+    private transient Map<String, Method> writeMethods = new HashMap<String, Method>();
+    private transient Map<String, Class<?>> types = new HashMap<String, Class<?>>();
 
     /**
      * An empty array.  Used to invoke accessors via reflection.