diff --git a/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/pipelines/gatk/GatkVcfSampleCompare.scala b/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/pipelines/gatk/GatkVcfSampleCompare.scala
index 82f9a23af528e8fc940f8b01de57f3a773733cfd..067012e443ee81958910e07fa0eb8c8361293bd8 100644
--- a/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/pipelines/gatk/GatkVcfSampleCompare.scala
+++ b/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/pipelines/gatk/GatkVcfSampleCompare.scala
@@ -7,7 +7,6 @@ import nl.lumc.sasc.biopet.extensions.gatk.CombineVariants
 import nl.lumc.sasc.biopet.extensions.gatk.SelectVariants
 import nl.lumc.sasc.biopet.extensions.gatk.VariantEval
 import org.broadinstitute.gatk.queue.QScript
-import org.broadinstitute.gatk.queue.extensions.gatk.{ CommandLineGATK }
 import org.broadinstitute.gatk.utils.commandline.{ Input, Argument }
 
 class GatkVcfSampleCompare(val root: Configurable) extends QScript with BiopetQScript {
@@ -29,10 +28,6 @@ class GatkVcfSampleCompare(val root: Configurable) extends QScript with BiopetQS
   var sampleVcfs: Map[String, File] = Map()
   def generalSampleDir = outputDir + "samples/"
 
-  trait gatkArguments extends CommandLineGATK {
-    this.reference_sequence = reference
-  }
-
   def init() {
     if (reference == null) reference = config("reference")
     if (config.contains("target_bed"))