diff --git a/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/JspTestBase.java b/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/JspTestBase.java
index 679d3ba..1cc7533 100644
--- a/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/JspTestBase.java
+++ b/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/JspTestBase.java
@@ -19,7 +19,7 @@
 /** Base class for tests that use JSP - configures the JSP
  *  scripting engine in a test-friendly way
  */
-public class JspTestBase extends RenderingTestBase {
+public abstract class JspTestBase extends RenderingTestBase {
 
     public static final String SCRIPT = "serverscripts/jsp-engine-setup.jsp";
     private static boolean jspEngineConfigured;
diff --git a/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/RenderingTestBase.java b/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/RenderingTestBase.java
index 6fa6ea8..2461038 100644
--- a/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/RenderingTestBase.java
+++ b/src/test/java/org/apache/sling/launchpad/webapp/integrationtest/RenderingTestBase.java
@@ -22,7 +22,7 @@
 
 /** Base class for rendering tests
  */
-class RenderingTestBase extends HttpTestBase {
+abstract class RenderingTestBase extends HttpTestBase {
     protected String scriptPath;
     protected String testText;
     protected String displayUrl;
@@ -36,4 +36,4 @@
             fail("Content does not contain '" + expected + "' (content=" + content + ")");
         }
     }
-}
\ No newline at end of file
+}