diff --git a/OpenRA.FileFormats/Filesystem/ZipFile.cs b/OpenRA.FileFormats/Filesystem/ZipFile.cs
index e1c57801dc..29792fd364 100644
--- a/OpenRA.FileFormats/Filesystem/ZipFile.cs
+++ b/OpenRA.FileFormats/Filesystem/ZipFile.cs
@@ -40,6 +40,8 @@ namespace OpenRA.FileFormats
 		public ZipFile(string filename, int priority, Dictionary<string, byte[]> contents)
 		{
 			this.priority = priority;
+			this.filename = filename;
+
 			if (File.Exists(filename))
 				File.Delete(filename);