diff --git a/internal/wisski/ingredient/barrel/drush/cron.go b/internal/wisski/ingredient/barrel/drush/cron.go
index d4ade99..974946c 100644
--- a/internal/wisski/ingredient/barrel/drush/cron.go
+++ b/internal/wisski/ingredient/barrel/drush/cron.go
@@ -15,7 +15,7 @@ import (
 )
 
 var errCronFailed = exit.Error{
-	Message:  "failed to run cron script for instance %q: exited with code %s",
+	Message:  "failed to run cron script for instance %q: exited with code %d",
 	ExitCode: exit.ExitGeneric,
 }