diff --git a/samples/client/petstore/spring-cloud-async/pom.xml b/samples/client/petstore/spring-cloud-async/pom.xml
index 1ee79c2f74d0..b14446583fb2 100644
--- a/samples/client/petstore/spring-cloud-async/pom.xml
+++ b/samples/client/petstore/spring-cloud-async/pom.xml
@@ -38,6 +38,12 @@
             <artifactId>swagger-annotations</artifactId>
             <version>${swagger-core-version}</version>
         </dependency>
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>3.0.2</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-openfeign</artifactId>