diff --git a/OpenRA.Mods.Common/Projectiles/Railgun.cs b/OpenRA.Mods.Common/Projectiles/Railgun.cs
index 5477b1fae7..f8bb6e8fa1 100644
--- a/OpenRA.Mods.Common/Projectiles/Railgun.cs
+++ b/OpenRA.Mods.Common/Projectiles/Railgun.cs
@@ -101,7 +101,7 @@ namespace OpenRA.Mods.Common.Projectiles
 		}
 	}
 
-	public class Railgun : IProjectile
+	public class Railgun : IProjectile, ISync
 	{
 		readonly ProjectileArgs args;
 		readonly RailgunInfo info;