diff --git a/code/game/turfs/simulated/floor/asteroid_floors.dm b/code/game/turfs/simulated/floor/asteroid_floors.dm
index e6035fe1b2f..9d374ffda3a 100644
--- a/code/game/turfs/simulated/floor/asteroid_floors.dm
+++ b/code/game/turfs/simulated/floor/asteroid_floors.dm
@@ -253,7 +253,7 @@ GLOBAL_LIST_INIT(megafauna_spawn_list, list(/mob/living/simple_animal/hostile/me
 			break
 
 		var/list/L = list(45)
-		if(ISODD(dir2angle(dir)) && (!SSmapping.cave_theme == BLOCKED_BURROWS || prob(33))) // We're going at an angle and we want thick angled tunnels.
+		if(ISODD(dir2angle(dir)) && (!(SSmapping.cave_theme == BLOCKED_BURROWS) || prob(15)))
 			L += -45
 
 		// Expand the edges of our tunnel