diff --git a/planet/Material.ocg/Rock.ocm b/planet/Material.ocg/Rock.ocm
index 59323970e..5b693f30a 100644
--- a/planet/Material.ocg/Rock.ocm
+++ b/planet/Material.ocg/Rock.ocm
@@ -10,3 +10,4 @@ MaxAirSpeed=100
 MaxSlide=250
 Placement=50
 TextureOverlay=rock
+MinShapeOverlap=8
\ No newline at end of file