diff --git a/flash.wdl b/flash.wdl
index 0cabd066ad0a787a31080d8ec1561c8dff710d3d..673da3d6b415a70f3787cc0b4e5e427edb208736 100644
--- a/flash.wdl
+++ b/flash.wdl
@@ -24,7 +24,6 @@ task flash {
     Boolean? compress = true
     Int? threads = 1
     Int? memory = 4
-    Int? cores = 1
 
     command {
         set -e -o pipefail
@@ -50,7 +49,7 @@ task flash {
     }
 
     runtime {
-        cpu: select_first([cores])
+        cpu: select_first([threads])
         memory: select_first([memory])
     }