diff --git a/OpenRA.Mods.Common/Traits/Multipliers/FirepowerMultiplier.cs b/OpenRA.Mods.Common/Traits/Multipliers/FirepowerMultiplier.cs
index 4f3d15d7a4..1d09992259 100644
--- a/OpenRA.Mods.Common/Traits/Multipliers/FirepowerMultiplier.cs
+++ b/OpenRA.Mods.Common/Traits/Multipliers/FirepowerMultiplier.cs
@@ -24,6 +24,6 @@ namespace OpenRA.Mods.Common.Traits
 		public FirepowerMultiplier(FirepowerMultiplierInfo info, string actorType)
 			: base(info, "FirepowerMultiplier", actorType) { }
 
-		public int GetFirepowerModifier() { return GetModifier(); }
+		int IFirepowerModifier.GetFirepowerModifier() { return GetModifier(); }
 	}
 }
diff --git a/OpenRA.Mods.Common/TraitsInterfaces.cs b/OpenRA.Mods.Common/TraitsInterfaces.cs
index 34339ac0d5..0bd7fdbc78 100644
--- a/OpenRA.Mods.Common/TraitsInterfaces.cs
+++ b/OpenRA.Mods.Common/TraitsInterfaces.cs
@@ -208,6 +208,8 @@ namespace OpenRA.Mods.Common.Traits
 
 	[RequireExplicitImplementation]
 	public interface ISpeedModifier { int GetSpeedModifier(); }
+
+	[RequireExplicitImplementation]
 	public interface IFirepowerModifier { int GetFirepowerModifier(); }
 	public interface IReloadModifier { int GetReloadModifier(); }
 	public interface IInaccuracyModifier { int GetInaccuracyModifier(); }