diff --git a/delly.wdl b/delly.wdl
index f97d9056dc7049e6895bc0da4d3c3907a70d7781..9a47e34e4203a282bad0d35ef6c6fa374ce7e532 100644
--- a/delly.wdl
+++ b/delly.wdl
@@ -9,7 +9,7 @@ task CallSV {
         File referenceFasta
         File referenceFastaFai
         String outputPath        
-        Int mem = 15
+        String memory = 15
         String dockerImage = "quay.io/biocontainers/delly:0.8.1--h4037b6b_1"
     }
     
@@ -28,6 +28,6 @@ task CallSV {
     
     runtime {
         docker: dockerImage
-        memory: mem
+        memory: memory
     }
 }
diff --git a/manta.wdl b/manta.wdl
index 47f7ace1699ecaea733c06fcd87a86d7cfb45524..3dd8703d0dd4b8a9ba8586db22c57411e3d85cec 100644
--- a/manta.wdl
+++ b/manta.wdl
@@ -71,7 +71,7 @@ task Germline {
         Boolean exome = false
         
         Int cores = 1
-        Int memory = 4
+        String memory = 4
     }
 
     command {
diff --git a/survivor.wdl b/survivor.wdl
index 9f0ea39bdc860d40f5488deb204fc2544a40e0d4..0ff513b3b47ce38699d8997e3e5add9ad11cdb5f 100644
--- a/survivor.wdl
+++ b/survivor.wdl
@@ -14,7 +14,7 @@ task Merge {
         Int minSize = 30
         String sample
         String outputPath
-        Int memory = 128
+        String memory = 128
     }
 
     command {