diff --git a/code/WorkInProgress/Chinsky/guestpass.dm b/code/WorkInProgress/Chinsky/guestpass.dm
index 5c16e83879f..5f798fa61af 100644
--- a/code/WorkInProgress/Chinsky/guestpass.dm
+++ b/code/WorkInProgress/Chinsky/guestpass.dm
@@ -127,7 +127,7 @@
 			if ("duration")
 				var/dur = input("Duration (in minutes) during which pass is valid (up to 30 minutes).", "Duration") as num|null
 				if (dur)
-					if (dur > 0 && dur < 30)
+					if (dur > 0 && dur <= 30)
 						duration = dur
 					else
 						usr << "<span class='warning'>Invalid duration.</span>"