diff --git a/compose/startup-order.md b/compose/startup-order.md
index 152ade0c88..88477929e2 100644
--- a/compose/startup-order.md
+++ b/compose/startup-order.md
@@ -54,7 +54,7 @@ script:
     check. For example, you might want to wait until Postgres is definitely
     ready to accept commands:
 
-        #!/bin/bash
+        #!/bin/sh
         # wait-for-postgres.sh
 
         set -e