diff --git a/base/.classpath b/base/.classpath
index a29fa09b40..e618a5af1b 100644
--- a/base/.classpath
+++ b/base/.classpath
@@ -22,5 +22,6 @@
 	<classpathentry kind="lib" path="/tools/lib/jfreechart-1.0.11.jar"/>
 	<classpathentry kind="lib" path="/tools/lib/swingx-0.9.0.jar"/>
 	<classpathentry kind="lib" path="/tools/lib/looks-2.0.4.jar"/>
+	<classpathentry kind="lib" path="/tools/lib/commons-collections-3.1.jar"/>
 	<classpathentry kind="output" path="build"/>
 </classpath>