diff --git a/biopet.wdl b/biopet.wdl
index c1bf0d62698508c2d823401a61c79181f885d7a1..1f04df32fceb027ede405476ed2f970af31911c8 100644
--- a/biopet.wdl
+++ b/biopet.wdl
@@ -313,7 +313,7 @@ task ValidateFastq {
 
     Float? memory
     Float? memoryMultiplier
-    Int mem = ceil(select_first([memory, 2.0]))
+    Int mem = ceil(select_first([memory, 4.0]))
 
     String toolCommand = if defined(toolJar)
     then "java -Xmx" + mem + "G -jar " + toolJar
@@ -330,7 +330,7 @@ task ValidateFastq {
         File stderr = stderr()
     }
     runtime {
-        memory: ceil(mem * select_first([memoryMultiplier, 1.5]))
+        memory: ceil(mem * select_first([memoryMultiplier, 2.0]))
     }
 }