diff --git a/pom.xml b/pom.xml
index 1469c11..c156bd8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -146,6 +146,7 @@
         - in a jarfile so it can control its place in the classpath.
         -->
       <plugin>      
+        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
         <configuration>
           <archive>
@@ -173,6 +174,7 @@
           - Alas, the standard jar plugin doesn't have includes/excludes support
           - in version 2.0, so antrun is used to create the other ones.
           -->
+        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-antrun-plugin</artifactId>
         <version>1.1</version>
         <executions>
@@ -293,6 +295,7 @@
           - normal test phase is therefore disabled here, and the test plugin
           - rebound to the "integration-test" phase instead.
           -->
+        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
           <includes>
@@ -341,6 +344,7 @@
       </plugin>
 
       <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-assembly-plugin</artifactId>
         <version>2.1</version>
         <configuration>