diff --git a/shiva/src/main/scala/nl/lumc/sasc/biopet/pipelines/shiva/variantcallers/HaplotypeCallerGvcf.scala b/shiva/src/main/scala/nl/lumc/sasc/biopet/pipelines/shiva/variantcallers/HaplotypeCallerGvcf.scala
index 585c33d649cf304e32c19e28ee7c6c294a75eca7..a08703e95dc4ce61437641df80dd3c8da1641394 100644
--- a/shiva/src/main/scala/nl/lumc/sasc/biopet/pipelines/shiva/variantcallers/HaplotypeCallerGvcf.scala
+++ b/shiva/src/main/scala/nl/lumc/sasc/biopet/pipelines/shiva/variantcallers/HaplotypeCallerGvcf.scala
@@ -27,7 +27,7 @@ class HaplotypeCallerGvcf(val root: Configurable) extends Variantcaller {
       sample -> hc.out
     }
 
-    val genotypeGVCFs = gatk.GenotypeGVCFs(this, gvcfFiles.toList, outputFile)
+    val genotypeGVCFs = gatk.GenotypeGVCFs(this, gvcfFiles.values.toList, outputFile)
     add(genotypeGVCFs)
   }
 }