diff --git a/code/ATMOSPHERICS/components/unary/vent_pump.dm b/code/ATMOSPHERICS/components/unary/vent_pump.dm
index 83f8eb7fcf6..1550eb7ae96 100644
--- a/code/ATMOSPHERICS/components/unary/vent_pump.dm
+++ b/code/ATMOSPHERICS/components/unary/vent_pump.dm
@@ -100,7 +100,7 @@
 			if(pressure_checks&2)
 				pressure_delta = min(pressure_delta, (air_contents.return_pressure() - internal_pressure_bound))
 
-			if(pressure_delta > 0)
+			if(pressure_delta > 0.5)
 				if(air_contents.temperature > 0)
 					var/transfer_moles = pressure_delta*environment.volume/(air_contents.temperature * R_IDEAL_GAS_EQUATION)
 
@@ -118,7 +118,7 @@
 			if(pressure_checks&2)
 				pressure_delta = min(pressure_delta, (internal_pressure_bound - air_contents.return_pressure()))
 
-			if(pressure_delta > 0)
+			if(pressure_delta > 0.5)
 				if(environment.temperature > 0)
 					var/transfer_moles = pressure_delta*air_contents.volume/(environment.temperature * R_IDEAL_GAS_EQUATION)