diff --git a/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/kraken/Kraken.scala b/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/kraken/Kraken.scala
index e4470ffec4f37c3b2c71a0b88f095cefb079741e..2316db57e4fd9d7c7b1d591d6c61d4e2b9e48f72 100644
--- a/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/kraken/Kraken.scala
+++ b/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/kraken/Kraken.scala
@@ -53,7 +53,7 @@ class Kraken(val root: Configurable) extends BiopetCommandLineFunction with Vers
 
   def versionCommand = executable + " --version"
 
-  override def defaultCoreMemory = 15.0
+  override def defaultCoreMemory = 17.0
 
   override def defaultThreads = 4
 
diff --git a/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/qiime/PickClosedReferenceOtus.scala b/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/qiime/PickClosedReferenceOtus.scala
index 265a6d21f941bfae7bc3c6b7c742993b9638e6c3..49181292137d86e2f67d3b2aa4f7b1bd905cb0e1 100644
--- a/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/qiime/PickClosedReferenceOtus.scala
+++ b/public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/qiime/PickClosedReferenceOtus.scala
@@ -17,8 +17,8 @@ class PickClosedReferenceOtus(val root: Configurable) extends BiopetCommandLineF
 
   var outputDir: File = null
 
-  override def defaultThreads = 2
-  override def defaultCoreMemory = 10.0
+  override def defaultThreads = 3
+  override def defaultCoreMemory = 12.0
   def versionCommand = executable + " --version"
   def versionRegex = """Version: (.*)""".r