diff --git a/OpenRA.Mods.Cnc/Traits/Infiltration/Infiltrates.cs b/OpenRA.Mods.Cnc/Traits/Infiltration/Infiltrates.cs
index 77c71cfe24..3b9e954570 100644
--- a/OpenRA.Mods.Cnc/Traits/Infiltration/Infiltrates.cs
+++ b/OpenRA.Mods.Cnc/Traits/Infiltration/Infiltrates.cs
@@ -23,9 +23,10 @@ namespace OpenRA.Mods.Cnc.Traits
 {
 	public class InfiltratesInfo : ConditionalTraitInfo
 	{
-		public readonly BitSet<TargetableType> Types;
+		public readonly BitSet<TargetableType> Types = default(BitSet<TargetableType>);
 
-		[VoiceReference] public readonly string Voice = "Action";
+		[VoiceReference]
+		public readonly string Voice = "Action";
 
 		[Desc("What diplomatic stances can be infiltrated by this actor.")]
 		public readonly Stance ValidStances = Stance.Neutral | Stance.Enemy;
@@ -36,7 +37,7 @@ namespace OpenRA.Mods.Cnc.Traits
 
 		[NotificationReference("Speech")]
 		[Desc("Notification to play when a building is infiltrated.")]
-		public readonly string Notification = "BuildingInfiltrated";
+		public readonly string Notification = null;
 
 		[Desc("Experience to grant to the infiltrating player.")]
 		public readonly int PlayerExperience = 0;
diff --git a/OpenRA.Mods.Common/UpdateRules/Rules/20180923/DefineNotificationDefaults.cs b/OpenRA.Mods.Common/UpdateRules/Rules/20180923/DefineNotificationDefaults.cs
index 56717105ae..d274a5a112 100644
--- a/OpenRA.Mods.Common/UpdateRules/Rules/20180923/DefineNotificationDefaults.cs
+++ b/OpenRA.Mods.Common/UpdateRules/Rules/20180923/DefineNotificationDefaults.cs
@@ -76,6 +76,9 @@ namespace OpenRA.Mods.Common.UpdateRules.Rules
 			}),
 			new TraitWrapper("PowerManager", new Dictionary<string, string> {
 				{ "SpeechNotification", "LowPower" }
+			}),
+			new TraitWrapper("Infiltrates", new Dictionary<string, string> {
+				{ "Notification", "BuildingInfiltrated" }
 			})
 		};
 
diff --git a/mods/ra/rules/infantry.yaml b/mods/ra/rules/infantry.yaml
index 0fa7414fa2..7191108412 100644
--- a/mods/ra/rules/infantry.yaml
+++ b/mods/ra/rules/infantry.yaml
@@ -289,6 +289,7 @@ SPY:
 		DisguisedCondition: disguise
 	Infiltrates:
 		Types: SpyInfiltrate
+		Notification: BuildingInfiltrated
 		PlayerExperience: 50
 	AutoTarget:
 		InitialStance: HoldFire
@@ -525,6 +526,7 @@ THF:
 	Passenger:
 		PipType: Blue
 	Infiltrates:
+		Notification: BuildingInfiltrated
 		PlayerExperience: 50
 	Voiced:
 		VoiceSet: ThiefVoice
diff --git a/mods/ts/rules/civilian-infantry.yaml b/mods/ts/rules/civilian-infantry.yaml
index cedde3fe75..0b6047673c 100644
--- a/mods/ts/rules/civilian-infantry.yaml
+++ b/mods/ts/rules/civilian-infantry.yaml
@@ -79,6 +79,7 @@ CHAMSPY:
 		RequiresCondition: disguise
 	Infiltrates:
 		Types: SpyInfiltrate
+		Notification: BuildingInfiltrated
 	-WithInfantryBody:
 	WithDisguisingInfantryBody:
 		IdleSequences: idle1,idle2