diff --git a/maven-plugin-plugin/pom.xml b/maven-plugin-plugin/pom.xml
index c619c70..aa1ba0c 100644
--- a/maven-plugin-plugin/pom.xml
+++ b/maven-plugin-plugin/pom.xml
@@ -58,7 +58,6 @@
     <doxia-sitetoolsVersion>1.2</doxia-sitetoolsVersion>
     <it.debug>true</it.debug>
     <mavenPluginPluginVersion>2.9</mavenPluginPluginVersion>
-    <mavenInvokerPluginVersion>1.6</mavenInvokerPluginVersion>
   </properties>
 
   <dependencies>
diff --git a/maven-plugin-tools-javadoc/pom.xml b/maven-plugin-tools-javadoc/pom.xml
index 6b23332..2378c3d 100644
--- a/maven-plugin-tools-javadoc/pom.xml
+++ b/maven-plugin-tools-javadoc/pom.xml
@@ -83,7 +83,9 @@
       <build>
         <plugins>
           <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-invoker-plugin</artifactId>
+            <version>${mavenInvokerPluginVersion}</version>
             <configuration>
               <debug>true</debug>
               <cloneProjectsTo>${project.build.directory}/it</cloneProjectsTo>
diff --git a/pom.xml b/pom.xml
index 50b6947..7cbbdd1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -162,6 +162,7 @@
     <siteUrl>http://maven.apache.org/plugin-tools/</siteUrl>
     <mavenVersion>2.2.1</mavenVersion>
     <antVersion>1.7.1</antVersion>
+    <mavenInvokerPluginVersion>1.6</mavenInvokerPluginVersion>
   </properties>
 
   <dependencyManagement>