diff --git a/openjpa-kernel/pom.xml b/openjpa-kernel/pom.xml
index 2f6bc3c2f..5f4e7a425 100644
--- a/openjpa-kernel/pom.xml
+++ b/openjpa-kernel/pom.xml
@@ -87,6 +87,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>javacc-maven-plugin</artifactId>
+                <version>2.1</version>
                 <executions>
                     <execution>
                         <id>jjtree-jpql</id>