diff --git a/biopet-framework/src/main/java/nl/lumc/sasc/biopet/core/BiopetQScript.scala b/biopet-framework/src/main/java/nl/lumc/sasc/biopet/core/BiopetQScript.scala
index 73893078c54552269c16eec3307dbded51c1447e..8b813bf613dee5dea52c8926e2e2bfdda7fa8ff5 100644
--- a/biopet-framework/src/main/java/nl/lumc/sasc/biopet/core/BiopetQScript.scala
+++ b/biopet-framework/src/main/java/nl/lumc/sasc/biopet/core/BiopetQScript.scala
@@ -4,7 +4,7 @@ package nl.lumc.sasc.biopet.core
 import java.io.File
 import org.broadinstitute.sting.queue.util.Logging
 
-trait BiopetQScript extends Logging {
+abstract trait BiopetQScript extends Logging {
   var config: Config = _
   var outputFiles:Map[String,File] = Map()