diff --git a/src/test/java/org/msgpack/rpc/reflect/AnnotationTest.java b/src/test/java/org/msgpack/rpc/reflect/AnnotationTest.java
index 3a8665f..6bc95c6 100644
--- a/src/test/java/org/msgpack/rpc/reflect/AnnotationTest.java
+++ b/src/test/java/org/msgpack/rpc/reflect/AnnotationTest.java
@@ -19,6 +19,7 @@
 
 import org.msgpack.*;
 import org.msgpack.annotation.*;
+import org.msgpack.annotation.Optional;
 import org.msgpack.rpc.*;
 import org.msgpack.rpc.dispatcher.*;
 import org.msgpack.rpc.config.*;