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
@@ -19,7 +19,7 @@ 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