diff --git a/karaf/assembly/src/main/filtered-resources/etc/config.properties b/karaf/assembly/src/main/filtered-resources/etc/config.properties
index fd83a3f..22d8f13 100644
--- a/karaf/assembly/src/main/filtered-resources/etc/config.properties
+++ b/karaf/assembly/src/main/filtered-resources/etc/config.properties
@@ -48,7 +48,7 @@
 org.osgi.framework.bootdelegation=sun.*,com.sun.*,javax.transaction,javax.transaction.*
 
 # OSGi Execution Environment
-org.osgi.framework.executionenvironment=J2SE-1.5
+org.osgi.framework.executionenvironment=J2SE-1.5,J2SE-1.4,J2SE-1.3
 
 # To enable the use of the startup.properties file to control the start level:
 karaf.auto.start=startup.properties