diff --git a/pregelix/pregelix-example/pom.xml b/pregelix/pregelix-example/pom.xml
index b3f78e1..e643331 100644
--- a/pregelix/pregelix-example/pom.xml
+++ b/pregelix/pregelix-example/pom.xml
@@ -77,6 +77,7 @@
 				</configuration>
 			</plugin>
 			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-clean-plugin</artifactId>
 				<version>2.5</version>
 				<configuration>