diff --git a/querydsl-jpa-codegen/src/main/java/com/mysema/query/jpa/codegen/AbstractDomainExporter.java b/querydsl-jpa-codegen/src/main/java/com/mysema/query/jpa/codegen/AbstractDomainExporter.java
index 640b7a040..f81bcc53f 100644
--- a/querydsl-jpa-codegen/src/main/java/com/mysema/query/jpa/codegen/AbstractDomainExporter.java
+++ b/querydsl-jpa-codegen/src/main/java/com/mysema/query/jpa/codegen/AbstractDomainExporter.java
@@ -146,7 +146,7 @@ public abstract class AbstractDomainExporter {
         Set<Supertype> additions = Sets.newHashSet();
         for (Map.Entry<Class<?>, EntityType> entry : allTypes.entrySet()) {
             EntityType entityType = entry.getValue();
-            if (entityType.getSuperType() != null && !allTypes.containsKey(entityType.getSuperType().getType())) {
+            if (entityType.getSuperType() != null && !allTypes.containsKey(entityType.getSuperType().getType().getJavaClass())) {
                 additions.add(entityType.getSuperType());
             }
         }