diff --git a/code/game/gamemodes/events.dm b/code/game/gamemodes/events.dm
index 5cc0205695f..6976b83d636 100644
--- a/code/game/gamemodes/events.dm
+++ b/code/game/gamemodes/events.dm
@@ -78,7 +78,8 @@
 		if(6)
 			viral_outbreak()
 		if(7)
-			alien_infestation()
+			if(prob(10))
+				alien_infestation()
 		if(8)
 			prison_break()
 		if(9)