diff --git a/code/__DEFINES/atmospherics.dm b/code/__DEFINES/atmospherics.dm
index 87975442c7..7707eb9ab0 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -39,8 +39,8 @@
 #define MINIMUM_TEMPERATURE_TO_MOVE					(T20C+100)			//or this (or both, obviously)
 #define MINIMUM_TEMPERATURE_DELTA_TO_SUSPEND		4		//Minimum temperature difference before group processing is suspended
 #define MINIMUM_TEMPERATURE_DELTA_TO_CONSIDER		0.5		//Minimum temperature difference before the gas temperatures are just set to be equal
-#define MINIMUM_TEMPERATURE_FOR_SUPERCONDUCTION		T20C+10
-#define MINIMUM_TEMPERATURE_START_SUPERCONDUCTION	T20C+200
+#define MINIMUM_TEMPERATURE_FOR_SUPERCONDUCTION		(T20C+10)
+#define MINIMUM_TEMPERATURE_START_SUPERCONDUCTION	(T20C+200)
 
 //HEAT TRANSFER COEFFICIENTS
 //Must be between 0 and 1. Values closer to 1 equalize temperature faster
@@ -51,11 +51,11 @@
 #define HEAT_CAPACITY_VACUUM				7000	//a hack to help make vacuums "cold", sacrificing realism for gameplay
 
 //FIRE
-#define FIRE_MINIMUM_TEMPERATURE_TO_SPREAD	150+T0C
-#define FIRE_MINIMUM_TEMPERATURE_TO_EXIST	100+T0C
+#define FIRE_MINIMUM_TEMPERATURE_TO_SPREAD	(150+T0C)
+#define FIRE_MINIMUM_TEMPERATURE_TO_EXIST	(100+T0C)
 #define FIRE_SPREAD_RADIOSITY_SCALE			0.85
 #define FIRE_GROWTH_RATE					40000	//For small fires
-#define PLASMA_MINIMUM_BURN_TEMPERATURE		100+T0C
+#define PLASMA_MINIMUM_BURN_TEMPERATURE		(100+T0C)
 
 //GASES
 #define MIN_TOXIC_GAS_DAMAGE				1
diff --git a/code/modules/atmospherics/gasmixtures/reactions.dm b/code/modules/atmospherics/gasmixtures/reactions.dm
index 5b77db3402..d2a12f0f9e 100644
--- a/code/modules/atmospherics/gasmixtures/reactions.dm
+++ b/code/modules/atmospherics/gasmixtures/reactions.dm
@@ -1,7 +1,7 @@
 //Plasma fire properties
 #define OXYGEN_BURN_RATE_BASE				1.4
 #define PLASMA_BURN_RATE_DELTA				9
-#define PLASMA_UPPER_TEMPERATURE			1370+T0C
+#define PLASMA_UPPER_TEMPERATURE			(1370+T0C)
 #define PLASMA_MINIMUM_OXYGEN_NEEDED		2
 #define PLASMA_MINIMUM_OXYGEN_PLASMA_RATIO	30
 #define PLASMA_OXYGEN_FULLBURN				10
@@ -28,7 +28,7 @@
 #define PLASMA_FUSED_COEFFICENT				0.08
 #define CATALYST_COEFFICENT					0.01
 #define FUSION_PURITY_THRESHOLD				0.95
-#define FUSION_HEAT_DROPOFF					20000+T0C
+#define FUSION_HEAT_DROPOFF					(20000+T0C)
 #define NOBLIUM_FORMATION_ENERGY			2e9 //1 Mole of Noblium takes the planck energy to condense.
 /datum/controller/subsystem/air/var/list/gas_reactions //this is our singleton of all reactions