diff --git a/math/ttmath/Makefile b/math/ttmath/Makefile
index 144d75ed4bdb..c557ae9f1e33 100644
--- a/math/ttmath/Makefile
+++ b/math/ttmath/Makefile
@@ -9,7 +9,8 @@ WWW=		https://ttmath.org
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYRIGHT
 
-FETCH_DEPENDS=	git:devel/git
+FETCH_DEPENDS=	ca_root_nss>0:security/ca_root_nss \
+		git:devel/git
 
 USES=		cmake:testing