diff --git a/java/dexpreopt_test.go b/java/dexpreopt_test.go
index 1c1070a..3d2c5c3 100644
--- a/java/dexpreopt_test.go
+++ b/java/dexpreopt_test.go
@@ -63,6 +63,7 @@
 				java_binary {
 					name: "foo",
 					srcs: ["a.java"],
+					main_class: "foo.bar.jb",
 				}`,
 			enabled: true,
 		},