diff --git a/pom.xml b/pom.xml
index f7b5d45..6fb3f51 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,6 +79,7 @@
 		<dependency>
 			<groupId>com.vaadin</groupId>
 			<artifactId>vaadin-core</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>