diff --git a/star.wdl b/star.wdl
index 6d80e9d3c3105268c3b59fbf18d60dcb91b5c67f..da90516d3c098b8bcd1fa7ec448c6a9df5a4c7ba 100644
--- a/star.wdl
+++ b/star.wdl
@@ -95,10 +95,10 @@ task Star {
         String outFileNamePrefix
         String outSAMtype = "BAM SortedByCoordinate"
         String readFilesCommand = "zcat"
-        Int outFilterScoreMin = 0
-        Float outFilterScoreMinOverLread = 0.66
-        Int outFilterMatchNmin = 0
-        Float outFilterMatchNminOverLread = 0.66
+        Int? outFilterScoreMin
+        Float? outFilterScoreMinOverLread
+        Int? outFilterMatchNmin
+        Float? outFilterMatchNminOverLread
         String? outStd
         String? twopassMode = "Basic"
         Array[String]? outSAMattrRGline