diff --git a/biowdl.wdl b/biowdl.wdl
index a3d835f27418138a2125bfdc9c16d2a3458c801c..c0e678f4efd93258d4f4ca1e9f706edeeca90ac5 100644
--- a/biowdl.wdl
+++ b/biowdl.wdl
@@ -27,6 +27,7 @@ task InputConverter {
         Boolean skipFileCheck=false
         Boolean checkFileMd5sums=true
         Boolean old=false
+        String dockerImage = "quay.io/biocontainers/biowdl-input-converter:0.1.0--py_0"
     }
 
     command <<<
@@ -42,6 +43,6 @@ task InputConverter {
     }
 
     runtime {
-        docker: "quay.io/biocontainers/biowdl-input-converter:0.1.0--py_0"
+        docker: dockerImage
     }
 }