diff --git a/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/KrakenReportToJson.scala b/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/KrakenReportToJson.scala
index 2a32e7396eb69a8a4fa955946a68064cf70d4054..989aa8882664d44f2c9bbe40e18f275f8e0dc284 100644
--- a/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/KrakenReportToJson.scala
+++ b/biopet-tools-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/tools/KrakenReportToJson.scala
@@ -42,7 +42,7 @@ class KrakenReportToJson(val root: Configurable) extends ToolCommandFunction wit
   @Output(doc = "Output JSON", shortName = "output", required = true)
   var output: File = _
 
-  override def defaultCoreMemory = 2.0
+  override def defaultCoreMemory = 4.0
 
   override def cmdLine =
     super.cmdLine +