diff --git a/biopet.wdl b/biopet.wdl
index 91030693ec8b0b074926f020a170482643a5ee6a..1f04df32fceb027ede405476ed2f970af31911c8 100644
--- a/biopet.wdl
+++ b/biopet.wdl
@@ -329,5 +329,8 @@ task ValidateFastq {
     output {
         File stderr = stderr()
     }
+    runtime {
+        memory: ceil(mem * select_first([memoryMultiplier, 2.0]))
+    }
 }