diff --git a/GainStation13/code/mechanics/water_sponge.dm b/GainStation13/code/mechanics/water_sponge.dm
index b43fc4f2c8..b2e2151ff8 100644
--- a/GainStation13/code/mechanics/water_sponge.dm
+++ b/GainStation13/code/mechanics/water_sponge.dm
@@ -49,9 +49,11 @@
 		if(breath)
 			var/pressure = breath.return_pressure()
 			var/total_moles = breath.total_moles()
-			//#define PP_MOLES(X) ((X / total_moles) * pressure)
+			#define PP_MOLES(X) ((X / total_moles) * pressure)
 			#define PP(air, gas) PP_MOLES(air.get_moles(gas))
 			var/gas_breathed = PP(breath,GAS_H2O)
+			#undef PP_MOLES
+			#undef PP
 			if(gas_breathed > 0)
 				H.reagents.add_reagent(/datum/reagent/water, gas_breathed)
 				breath.adjust_moles(GAS_H2O, -gas_breathed)