diff --git a/workflows/tool.echo/echo.cwl b/workflows/tool.echo/echo.cwl
index af0c4de297d5d1becc18860e23f55f2be70c1c1a..e96d0ba73fac99b5d5bef158f91e0a3fb35728e9 100644
--- a/workflows/tool.echo/echo.cwl
+++ b/workflows/tool.echo/echo.cwl
@@ -1,6 +1,12 @@
 cwlVersion: v1.0
 class: CommandLineTool
+
+hints:
+  - class: DockerRequirement
+    dockerPull: alpine
+
 baseCommand: echo
+
 inputs:
   message:
     type: string