diff --git a/spades.wdl b/spades.wdl
index 7fd0c986d8555ddb0f816803dd6b6a20d2e04cbe..28fd8085d41f2052ca077f17dc59a35a05766755 100644
--- a/spades.wdl
+++ b/spades.wdl
@@ -22,7 +22,7 @@ task spades {
     Boolean? disableRepeatResolution
     File? dataset
     Int? threads
-    Int? memoryGb
+    Float? memoryGb
     File? tmpDir
     String? k
     Float? covCutoff