diff --git a/src/pp/pp_sim/pp_sim_core.c b/src/pp/pp_sim/pp_sim_core.c
index e3a1fcf1..6bf337df 100644
--- a/src/pp/pp_sim/pp_sim_core.c
+++ b/src/pp/pp_sim/pp_sim_core.c
@@ -593,6 +593,7 @@ void S_TickForever(WaveLaneCtx *lane)
         test_rect.p1 = VEC2(1, 1);
 
         constraint->shape1 = S_ShapeFromDesc(
+          .radius = 0.2,
           .count = 4,
           .points[0] = VEC2(test_rect.p0.x, test_rect.p0.y),
           .points[1] = VEC2(test_rect.p1.x, test_rect.p0.y),