diff --git a/code/game/turfs/closed.dm b/code/game/turfs/closed.dm
index 77b6c3ed098..9c67405a0aa 100644
--- a/code/game/turfs/closed.dm
+++ b/code/game/turfs/closed.dm
@@ -23,7 +23,7 @@
 	icon = 'icons/turf/walls.dmi'
 	explosion_block = 50
 
-/turf/closed/indestructible/TerraformTurf(path, defer_change = FALSE, ignore_air = FALSE)
+/turf/closed/indestructible/TerraformTurf(path, new_baseturf, flags, defer_change = FALSE, ignore_air = FALSE)
 	return
 
 /turf/closed/indestructible/acid_act(acidpwr, acid_volume, acid_id)
diff --git a/code/game/turfs/open.dm b/code/game/turfs/open.dm
index 300d7be5672..2efd51a6bae 100644
--- a/code/game/turfs/open.dm
+++ b/code/game/turfs/open.dm
@@ -49,7 +49,7 @@
 /turf/open/indestructible/singularity_act()
 	return
 
-/turf/open/indestructible/TerraformTurf(path, defer_change = FALSE, ignore_air = FALSE)
+/turf/open/indestructible/TerraformTurf(path, new_baseturf, flags, defer_change = FALSE, ignore_air = FALSE)
 	return
 
 /turf/open/indestructible/sound