diff --git a/rug.cpp b/rug.cpp
index 171c6f68..b358eb24 100644
--- a/rug.cpp
+++ b/rug.cpp
@@ -533,7 +533,7 @@ EX void buildRug() {
     cell *c = p.first;
     rugpoint *v = p.second;
     
-    if(arcm::in() || (euclid && quotient)) {
+    if(arcm::in() || arb::in() || (euclid && quotient)) {
       vector<rugpoint*> p(c->type+1);
       for(int j=0; j<c->type; j++) p[j] = findOrAddRugpoint(ggmatrix(c) * get_corner_position(c, j), v->dist);
       for(int j=0; j<c->type; j++) addTriangle(v, p[j], p[(j+1) % c->type]);