diff --git a/OpenRA.Mods.Common/Traits/Upgrades/UpgradeManager.cs b/OpenRA.Mods.Common/Traits/Upgrades/UpgradeManager.cs
index 09a07cbe50..d4e402d4c8 100644
--- a/OpenRA.Mods.Common/Traits/Upgrades/UpgradeManager.cs
+++ b/OpenRA.Mods.Common/Traits/Upgrades/UpgradeManager.cs
@@ -125,6 +125,13 @@ namespace OpenRA.Mods.Common.Traits
 			NotifyUpgradeLevelChanged(s.Traits, self, upgrade, -1);
 		}
 
+		/// <summary>Returns true if the actor uses the given upgrade. Does not check the actual level of the upgrade.</summary>
+		public bool AcknowledgesUpgrade(Actor self, string upgrade)
+		{
+			return upgrades.Value.ContainsKey(upgrade);
+		}
+
+		/// <summary>Returns true only if the actor can accept another level of the upgrade.</summary>
 		public bool AcceptsUpgrade(Actor self, string upgrade)
 		{
 			UpgradeState s;
diff --git a/OpenRA.Mods.RA/Traits/Disguise.cs b/OpenRA.Mods.RA/Traits/Disguise.cs
index 3618dbbb46..7dae8aa490 100644
--- a/OpenRA.Mods.RA/Traits/Disguise.cs
+++ b/OpenRA.Mods.RA/Traits/Disguise.cs
@@ -166,7 +166,7 @@ namespace OpenRA.Mods.RA.Traits
 			{
 				foreach (var u in info.Upgrades)
 				{
-					if (!um.Value.AcceptsUpgrade(self, u))
+					if (!um.Value.AcknowledgesUpgrade(self, u))
 						continue;
 
 					if (Disguised)