diff --git a/nodes.lua b/nodes.lua
index a13d36a..351ab6b 100644
--- a/nodes.lua
+++ b/nodes.lua
@@ -165,19 +165,19 @@ local nodes = {
 	},
 	["dirt_compressed"] = {
 		description = S("Compressed Dirt"),
-		groups = {crumbly=2},
+		groups = {crumbly=2, compressed = 1},
 		is_ground_content = false,
 		sounds = sound_dirt,
 	},
 	["cobble_compressed"] = {
 		description = S("Compressed Cobblestone"),
-		groups = {cracky = 1},
+		groups = {cracky = 1, compressed = 1},
 		is_ground_content = false,
 		sounds = sound_stone,
 	},
 	["desert_cobble_compressed"] = {
 		description = S("Compressed Desert Cobblestone"),
-		groups = {cracky = 1},
+		groups = {cracky = 1, compressed = 1},
 		is_ground_content = false,
 		sounds = sound_stone,
 	},
diff --git a/stairsplus/common.lua b/stairsplus/common.lua
index 0dc5945..d41eb30 100644
--- a/stairsplus/common.lua
+++ b/stairsplus/common.lua
@@ -175,7 +175,7 @@ stairsplus.register_single = function(category, alternate, info, modname, subnam
 		end
 	end
 
-	if fields.drop and not (type(fields.drop) == "table") then
+	if fields.drop and (type(fields.drop) ~= "table") then
 		def.drop = modname.. ":" .. category .. "_" .. fields.drop .. alternate
 	end