diff --git a/test/transform/resource/before/OnXFlagUsage.java b/test/transform/resource/before/OnXFlagUsage.java
index 8f7f4632..7e7a48bf 100644
--- a/test/transform/resource/before/OnXFlagUsage.java
+++ b/test/transform/resource/before/OnXFlagUsage.java
@@ -1,3 +1,4 @@
+//version 8:
 //conf: lombok.onX.flagUsage = warning
 //skip compare content: We're just checking if the flagUsage key works.
 import lombok.AllArgsConstructor;