diff --git a/www/py-werkzeug/Makefile b/www/py-werkzeug/Makefile
index 8d4c304698d0..aa5d05ede3a0 100644
--- a/www/py-werkzeug/Makefile
+++ b/www/py-werkzeug/Makefile
@@ -1,38 +1,39 @@
 # Created by: Moggie <moggie@elasticmind.net>
 
 PORTNAME=	werkzeug
 PORTVERSION=	2.0.1
 CATEGORIES=	www python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	Werkzeug-${DISTVERSION}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Python utilities collection for building WSGI applications
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.rst
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}openssl>=16.0:security/py-openssl@${PY_FLAVOR}
 
 USES=		python:3.6+
 USE_PYTHON=	autoplist concurrent distutils
 
 NO_ARCH=	yes
 
 OPTIONS_DEFINE=	EXAMPLES WATCHDOG
 WATCHDOG_DESC=	Monitor filesystem events
 
 WATCHDOG_RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}watchdog>=0:devel/py-watchdog@${PY_FLAVOR}
 
 .include <bsd.port.pre.mk>
 
 .if ${PYTHON_REL} < 3700
+BUILD_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}dataclasses>=0:devel/py-dataclasses@${PY_FLAVOR}
 RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}dataclasses>=0:devel/py-dataclasses@${PY_FLAVOR}
 .endif
 
 post-install-EXAMPLES-on:
 	${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
 	cd ${WRKSRC}/examples/ && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR}
 
 .include <bsd.port.post.mk>