diff --git a/code/modules/atmospherics/gasmixtures/reactions.dm b/code/modules/atmospherics/gasmixtures/reactions.dm
index 2bfe1cec71..5bd8c548f7 100644
--- a/code/modules/atmospherics/gasmixtures/reactions.dm
+++ b/code/modules/atmospherics/gasmixtures/reactions.dm
@@ -496,10 +496,4 @@
 #undef STIMULUM_SECOND_RISE
 #undef STIMULUM_ABSOLUTE_DROP
 #undef REACTION_OPPRESSION_THRESHOLD
-#undef PLASMA_BINDING_ENERGY
-#undef MAX_CATALYST_EFFICENCY
-#undef PLASMA_FUSED_COEFFICENT
-#undef CATALYST_COEFFICENT
-#undef FUSION_PURITY_THRESHOLD
-#undef FUSION_HEAT_DROPOFF
 #undef NOBLIUM_FORMATION_ENERGY