diff --git a/graphics/py-spectra/Makefile b/graphics/py-spectra/Makefile
index 7fc402b31aa6..08efcc7ad381 100644
--- a/graphics/py-spectra/Makefile
+++ b/graphics/py-spectra/Makefile
@@ -1,24 +1,26 @@
 PORTNAME=	spectra
 DISTVERSION=	0.0.11
+PORTREVISION=	1
 CATEGORIES=	graphics python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	jwb@FreeBSD.org
 COMMENT=	Color scales and color conversion made easy for Python
 WWW=		https://pypi.python.org/pypi/spectra
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
+RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}colormath>3.0.0:math/py-colormath@${PY_FLAVOR}
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}nose>0:devel/py-nose@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	autoplist distutils
 
 NO_ARCH=	yes
 
 do-test:
 	@cd ${WRKSRC} && ${PYTHON_CMD} -m nose -v test
 
 .include <bsd.port.mk>