diff --git a/loadtesting.cfg b/loadtesting.cfg
index dcbe2e2c78..39c31c7022 100644
--- a/loadtesting.cfg
+++ b/loadtesting.cfg
@@ -28,3 +28,7 @@ profiles-initial =
 
 [sources]
 collective.coreloadtests = svn http://svn.plone.org/svn/collective/collective.coreloadtests/trunk
+
+# Pin Selenium to 2.4.0, 2.5.0 has an installation issue.
+[versions]
+selenium = 2.4.0