diff --git a/mithril.scm b/mithril.scm
index c5b47c6..33be6e7 100644
--- a/mithril.scm
+++ b/mithril.scm
@@ -27,7 +27,7 @@ heading component:
     (error (format
 	    "mithril:comp-> Component macro expects even length args list.
 
-Call: (mithril:comp ~S ~S)"
+Call: (mithril:comp ~s ~s)"
 	    view args)))
   `(object
     :view