diff --git a/delly.wdl b/delly.wdl
index e00990645b8120a8a74f3d3b6743f466ae6b392c..1bce6f7593a67d40cc277b02165133ddbb2ba2bb 100644
--- a/delly.wdl
+++ b/delly.wdl
@@ -7,6 +7,7 @@ task CallSV {
         IndexedBamFile bamFile
         Reference reference
         String outputPath        
+        Int mem = 5
     }
     
 
@@ -25,7 +26,7 @@ task CallSV {
     
     runtime {
         docker: "quay.io/biocontainers/delly:0.8.1--h4037b6b_1"
-        memory: "5G"
+        memory: mem
     }
 
 }