diff --git a/astro/py-erfa/Makefile b/astro/py-erfa/Makefile
index 7ed7aa8a1e0..2c7a268a611 100644
--- a/astro/py-erfa/Makefile
+++ b/astro/py-erfa/Makefile
@@ -25,6 +25,7 @@ FLAVOR=		python3
 FLAVORS=	python3
 
 BUILD_DEPENDS=	devel/py-setuptools_scm${MODPY_FLAVOR} \
+		math/py-numpy${MODPY_FLAVOR} \
 		sysutils/py-packaging${MODPY_FLAVOR}
 RUN_DEPENDS=	math/py-numpy${MODPY_FLAVOR}
 TEST_DEPENDS=	devel/py-test-doctestplus${MODPY_FLAVOR}