diff --git a/examples/main_fof.c b/examples/main_fof.c
index e75c48d8db201ec39a5e8e088e0aceaf5eb77c0f..f0ed035630f819c79969ccbd4f1f59d7317acf60 100644
--- a/examples/main_fof.c
+++ b/examples/main_fof.c
@@ -628,6 +628,7 @@ int main(int argc, char *argv[]) {
               /*hydro_properties=*/NULL, /*entropy_floor=*/NULL,
               &gravity_properties,
               /*stars_properties=*/NULL, /*black_holes_properties=*/NULL,
+              /*sink_properties=*/NULL,
               /*feedback_properties=*/NULL, &mesh, /*potential=*/NULL,
               /*cooling_func=*/NULL, /*starform=*/NULL, /*chemistry=*/NULL,
               &fof_properties, /*los_properties=*/NULL);