diff --git a/test/transform/resource/after-delombok/SingularCleanupForDelombok.java b/test/transform/resource/after-delombok/SingularCleanupForDelombok.java
index 69ae310d2..ff67af594 100644
--- a/test/transform/resource/after-delombok/SingularCleanupForDelombok.java
+++ b/test/transform/resource/after-delombok/SingularCleanupForDelombok.java
@@ -1,3 +1,4 @@
+// version 8:
 import java.util.Set;
 import lombok.NonNull;
 class Book {
diff --git a/test/transform/resource/before/SingularCleanupForDelombok.java b/test/transform/resource/before/SingularCleanupForDelombok.java
index 49ed8b1ec..4e8beba18 100644
--- a/test/transform/resource/before/SingularCleanupForDelombok.java
+++ b/test/transform/resource/before/SingularCleanupForDelombok.java
@@ -1,3 +1,4 @@
+// version 8:
 // issue #1377: @Singular is not removed by delombok.
 
 import java.util.Set;