diff --git a/math/vtk-python/Makefile b/math/vtk-python/Makefile
index bffd5092bc14..6ee1871a9c95 100644
--- a/math/vtk-python/Makefile
+++ b/math/vtk-python/Makefile
@@ -35,7 +35,7 @@ CMAKE_DEFS=	-DVTK_WRAP_PYTHON:BOOL=ON \
 		-DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBDIR}/config/lib${PYTHON_VERSION}.a \
 		-DTCL_INCLUDE_PATH:PATH=${TCL_INCLUDE_DIR} \
 		-DTK_INCLUDE_PATH:PATH=${TK_INCLUDE_DIR} \
-		-DEXPAT_LIBRARY:PATH=${LOCALBASE}/libexpat.so \
+		-DEXPAT_LIBRARY:PATH=${LOCALBASE}/lib/expat.so \
 		-DEXPAT_INCLUDE_DIR:PATH=${LOCALBASE}/include \
 		-DCMAKE_BACKWARDS_COMPATIBILITY:STRING=2.2