diff --git a/public/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/GensToVcf.scala b/public/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/GensToVcf.scala
index bab7b8fd5d998a26b60935a40d1dab61289588f6..53816acdda3c322d74a8811195bd24d6765f5115 100644
--- a/public/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/GensToVcf.scala
+++ b/public/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/GensToVcf.scala
@@ -47,7 +47,7 @@ class GensToVcf(val root: Configurable) extends ToolCommandFunction with Referen
 
   var sortInput: Boolean = false
 
-  override def defaultCoreMemory = 5.0
+  override def defaultCoreMemory = 6.0
 
   override def beforeGraph(): Unit = {
     super.beforeGraph()