diff --git a/extra/mason/release/sign/sign.factor b/extra/mason/release/sign/sign.factor
index 0ef5ed9bc2..56652c5e89 100644
--- a/extra/mason/release/sign/sign.factor
+++ b/extra/mason/release/sign/sign.factor
@@ -17,6 +17,8 @@ IN: mason.release.sign
 
 HOOK: cert-path os ( -- path/f )
 
+M: object cert-path f ;
+
 M: macosx cert-path
     home "config/mac_app.cer" append-path ;