diff --git a/code/game/objects/structures/false_walls.dm b/code/game/objects/structures/false_walls.dm
index 35b95972127..5e6576c814a 100644
--- a/code/game/objects/structures/false_walls.dm
+++ b/code/game/objects/structures/false_walls.dm
@@ -27,8 +27,8 @@
 	max_integrity = 100
 
 	smoothing_flags = SMOOTH_BITMASK
-	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS)
-	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
+	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_AIRLOCK)
+	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
 
 /obj/structure/falsewall/Initialize(mapload)
 	. = ..()
@@ -170,8 +170,8 @@
 	walltype = /turf/simulated/wall/r_wall
 	mineral = /obj/item/stack/sheet/plasteel
 	smoothing_flags = SMOOTH_BITMASK
-	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
-	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
+	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
+	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
 
 /obj/structure/falsewall/reinforced/examine_status(mob/user)
 	. = ..()
diff --git a/code/game/objects/structures/window.dm b/code/game/objects/structures/window.dm
index 84ce5ba329a..3f5e6f89dc1 100644
--- a/code/game/objects/structures/window.dm
+++ b/code/game/objects/structures/window.dm
@@ -651,8 +651,8 @@
 	fulltile = TRUE
 	flags = PREVENT_CLICK_UNDER
 	smoothing_flags = SMOOTH_BITMASK
-	smoothing_groups = list(SMOOTH_GROUP_WINDOW_FULLTILE, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS) //they are not walls but this lets walls smooth with them
-	canSmoothWith = list(SMOOTH_GROUP_WINDOW_FULLTILE, SMOOTH_GROUP_WALLS)
+	smoothing_groups = list(SMOOTH_GROUP_WINDOW_FULLTILE, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK) //they are not walls but this lets walls smooth with them
+	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_WINDOW_FULLTILE, SMOOTH_GROUP_AIRLOCK)
 
 /obj/structure/window/full/basic
 	desc = "It looks thin and flimsy. A few knocks with... anything, really should shatter it."
diff --git a/code/game/turfs/simulated/walls.dm b/code/game/turfs/simulated/walls.dm
index 489ca56bb1f..d5dee7aef2e 100644
--- a/code/game/turfs/simulated/walls.dm
+++ b/code/game/turfs/simulated/walls.dm
@@ -9,8 +9,8 @@
 	icon_state = "wall-0"
 	base_icon_state = "wall"
 	smoothing_flags = SMOOTH_BITMASK
-	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS)
-	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
+	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_AIRLOCK)
+	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
 
 	var/rotting = FALSE
 
diff --git a/code/game/turfs/simulated/walls_reinforced.dm b/code/game/turfs/simulated/walls_reinforced.dm
index f6916808b9d..ea17f07f22d 100644
--- a/code/game/turfs/simulated/walls_reinforced.dm
+++ b/code/game/turfs/simulated/walls_reinforced.dm
@@ -15,8 +15,8 @@
 	sheet_amount = 1
 	girder_type = /obj/structure/girder/reinforced
 	can_dismantle_with_welder = FALSE
-	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
-	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS)
+	smoothing_groups = list(SMOOTH_GROUP_SIMULATED_TURFS, SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
+	canSmoothWith = list(SMOOTH_GROUP_WALLS, SMOOTH_GROUP_REGULAR_WALLS, SMOOTH_GROUP_REINFORCED_WALLS, SMOOTH_GROUP_AIRLOCK)
 
 	var/d_state = RWALL_INTACT
 	var/can_be_reinforced = 1