diff --git a/biology/py-libnuml/Makefile b/biology/py-libnuml/Makefile
index dcd1b9df3d08..8c84750f95e5 100644
--- a/biology/py-libnuml/Makefile
+++ b/biology/py-libnuml/Makefile
@@ -1,31 +1,31 @@
 PORTNAME=	libnuml
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.1.4
 CATEGORIES=	biology devel
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Numerical Markup Language for Python
 
 LICENSE=	LGPL21
 
 BUILD_DEPENDS=	swig:devel/swig
 LIB_DEPENDS=	libnuml.so:biology/libnuml
 
 USES=		cmake localbase:ldflags python
 USE_PYTHON=	flavors
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	NuML
 GH_PROJECT=	NuML
 
-WKSRC_SUBDIR=	${PORTNAME}/src/bindings/python
+WRKSRC_SUBDIR=	${PORTNAME}/src/bindings/python
 
 CMAKE_ARGS=	-DCMAKE_INSTALL_LIBDIR=lib
 
 LDFLAGS+=	-lnuml # otherwise it builds a broken shared object, see https://github.com/NuML/NuML/issues/21
 
 post-extract:
 	@${RLN} ${WRKSRC}/../../../VERSION.txt ${WRKSRC}/VERSION.txt
 
 .include <bsd.port.mk>