diff --git a/app-crypt/tang/tang-15.ebuild b/app-crypt/tang/tang-15-r1.ebuild
similarity index 97%
rename from app-crypt/tang/tang-15.ebuild
rename to app-crypt/tang/tang-15-r1.ebuild
index 6445c82f08..150cf0e914 100644
--- a/app-crypt/tang/tang-15.ebuild
+++ b/app-crypt/tang/tang-15-r1.ebuild
@@ -20,6 +20,7 @@ DEPEND="
 RDEPEND="
 	${DEPEND}
 	acct-user/tang
+	dev-libs/jansson
 	net-misc/socat
 "
 BDEPEND="app-text/asciidoc"