diff --git a/OpenRA.Game/Traits/Attack/AttackBase.cs b/OpenRA.Game/Traits/Attack/AttackBase.cs
index d1405a1666..e809a4a6c9 100755
--- a/OpenRA.Game/Traits/Attack/AttackBase.cs
+++ b/OpenRA.Game/Traits/Attack/AttackBase.cs
@@ -170,7 +170,7 @@ namespace OpenRA.Traits
 
 			var args = new ProjectileArgs
 			{
-				weapon = Rules.Weapons[weaponName],
+				weapon = Rules.Weapons[weaponName.ToLowerInvariant()],
 
 				firedBy = self,
 				target = target,