diff --git a/language-support/java/codegen/src/main/scala/com/digitalasset/daml/lf/codegen/backend/java/inner/ClassForType.scala b/language-support/java/codegen/src/main/scala/com/digitalasset/daml/lf/codegen/backend/java/inner/ClassForType.scala
index e92acbcf6a..f5213c80d9 100644
--- a/language-support/java/codegen/src/main/scala/com/digitalasset/daml/lf/codegen/backend/java/inner/ClassForType.scala
+++ b/language-support/java/codegen/src/main/scala/com/digitalasset/daml/lf/codegen/backend/java/inner/ClassForType.scala
@@ -72,7 +72,7 @@ object ClassForType extends StrictLogging {
             typeWithContext.interface.packageId,
             interfaceName,
           )
-    } yield javaFile(packageName, interfaceClass)
+    } yield javaFile(s"blah.$packageName", interfaceClass)
 
   private def generateSerializableTypes(
       typeWithContext: TypeWithContext,