diff --git a/biology/libsbml/Makefile b/biology/libsbml/Makefile
index dd2265f773ef..4c9c7f49048b 100644
--- a/biology/libsbml/Makefile
+++ b/biology/libsbml/Makefile
@@ -39,7 +39,7 @@ PYTHON_USES=		python:3.6+
 PYTHON_CMAKE_ON=	WITH_SWIG
 RUBY_BUILD_DEPENDS=	swig:devel/swig
 RUBY_CMAKE_BOOL=	WITH_RUBY
-RUBY_USE=		ruby=yes
+RUBY_USES=		ruby
 XERCES_CMAKE_BOOL=	WITH_XERCES
 XERCES_LIB_DEPENDS=	libxerces-c.so:textproc/xerces-c3