diff --git a/code/modules/blob/blob.dm b/code/modules/blob/blob.dm
index a2de592b84..7db20fe1ce 100644
--- a/code/modules/blob/blob.dm
+++ b/code/modules/blob/blob.dm
@@ -54,7 +54,7 @@
 	update_icon()
 
 /obj/effect/blob/proc/expand(var/turf/T)
-	if(istype(T, /turf/unsimulated/) || istype(T, /turf/space))
+	if(istype(T, /turf/unsimulated/) || istype(T, /turf/space) || (istype(T, /turf/simulated/mineral) && T.density))
 		return
 	if(istype(T, /turf/simulated/wall))
 		var/turf/simulated/wall/SW = T