diff --git a/code/controllers/subsystem/explosion.dm b/code/controllers/subsystem/explosion.dm
index f4637725c5121..d74e8910d94bb 100644
--- a/code/controllers/subsystem/explosion.dm
+++ b/code/controllers/subsystem/explosion.dm
@@ -625,8 +625,6 @@ SUBSYSTEM_DEF(explosions)
 
 	currentpart = SSEXPLOSIONS_TURFS
 
-#undef SSAIR_REBUILD_PIPENETS
-
 #undef EXPLOSION_THROW_SPEED
 #undef SSEX_TURF
 #undef SSEX_OBJ