diff --git a/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/HibernateQuery.java b/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/HibernateQuery.java
index af6e17aa4..dd2a344a4 100644
--- a/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/HibernateQuery.java
+++ b/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/HibernateQuery.java
@@ -20,7 +20,7 @@ import com.mysema.query.jpa.JPQLTemplates;
  * @author tiwe
  *
  */
-public final class HibernateQuery extends AbstractHibernateQuery<HibernateQuery> implements JPQLQuery{
+public final class HibernateQuery extends AbstractHibernateQuery<HibernateQuery> implements JPQLQuery {
 
     /**
      * Creates a detached query
@@ -84,7 +84,7 @@ public final class HibernateQuery extends AbstractHibernateQuery<HibernateQuery>
      * @param templates
      * @param metadata
      */
-    protected HibernateQuery(SessionHolder session, JPQLTemplates templates, QueryMetadata metadata) {
+    public HibernateQuery(SessionHolder session, JPQLTemplates templates, QueryMetadata metadata) {
         super(session, templates, metadata);
     }
 
diff --git a/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/sql/HibernateSQLQuery.java b/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/sql/HibernateSQLQuery.java
index d403cb583..b62acab17 100644
--- a/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/sql/HibernateSQLQuery.java
+++ b/querydsl-jpa/src/main/java/com/mysema/query/jpa/hibernate/sql/HibernateSQLQuery.java
@@ -31,7 +31,7 @@ public final class HibernateSQLQuery extends AbstractHibernateSQLQuery<Hibernate
         super(session, sqlTemplates);
     }
     
-    protected HibernateSQLQuery(SessionHolder session, SQLTemplates sqlTemplates, QueryMetadata metadata) {
+    public HibernateSQLQuery(SessionHolder session, SQLTemplates sqlTemplates, QueryMetadata metadata) {
         super(session, sqlTemplates, metadata);
     }
     
diff --git a/querydsl-jpa/src/main/java/com/mysema/query/jpa/impl/JPAQuery.java b/querydsl-jpa/src/main/java/com/mysema/query/jpa/impl/JPAQuery.java
index a4948ab79..01acb125e 100644
--- a/querydsl-jpa/src/main/java/com/mysema/query/jpa/impl/JPAQuery.java
+++ b/querydsl-jpa/src/main/java/com/mysema/query/jpa/impl/JPAQuery.java
@@ -64,7 +64,7 @@ public final class JPAQuery extends AbstractJPAQuery<JPAQuery> implements JPQLQu
      * @param templates
      * @param metadata
      */
-    protected JPAQuery(JPASessionHolder session, JPQLTemplates templates, QueryMetadata metadata) {
+    public JPAQuery(JPASessionHolder session, JPQLTemplates templates, QueryMetadata metadata) {
         super(session, templates, metadata);
     }
 
diff --git a/querydsl-jpa/src/main/java/com/mysema/query/jpa/sql/JPASQLQuery.java b/querydsl-jpa/src/main/java/com/mysema/query/jpa/sql/JPASQLQuery.java
index 188138c13..954871d48 100644
--- a/querydsl-jpa/src/main/java/com/mysema/query/jpa/sql/JPASQLQuery.java
+++ b/querydsl-jpa/src/main/java/com/mysema/query/jpa/sql/JPASQLQuery.java
@@ -26,7 +26,7 @@ public final class JPASQLQuery extends AbstractJPASQLQuery<JPASQLQuery> implemen
         super(entityManager, sqlTemplates);
     }
 
-    protected JPASQLQuery(JPASessionHolder session, SQLTemplates sqlTemplates, QueryMetadata metadata) {
+    public JPASQLQuery(JPASessionHolder session, SQLTemplates sqlTemplates, QueryMetadata metadata) {
         super(session, sqlTemplates, metadata);
     }
     
diff --git a/querydsl-jpa/src/test/java/com/mysema/query/SignatureTest.java b/querydsl-jpa/src/test/java/com/mysema/query/SignatureTest.java
new file mode 100644
index 000000000..ef86bb9d7
--- /dev/null
+++ b/querydsl-jpa/src/test/java/com/mysema/query/SignatureTest.java
@@ -0,0 +1,22 @@
+package com.mysema.query;
+
+import org.junit.Test;
+
+import com.mysema.query.jpa.JPQLQuery;
+import com.mysema.query.jpa.hibernate.HibernateQuery;
+import com.mysema.query.jpa.impl.JPAQuery;
+
+public class SignatureTest {
+    
+    @Test
+    public void test() {
+        meet((JPAQuery)null);
+        meet((HibernateQuery)null);
+        meet((JPQLQuery)null);
+    }
+    
+    public static <T extends FilteredClause<? super T>> T meet(T query) {
+        return null;
+    }
+
+}