diff --git a/OpenRA.Game/Map/Map.cs b/OpenRA.Game/Map/Map.cs
index 06644b43dc..24be905584 100644
--- a/OpenRA.Game/Map/Map.cs
+++ b/OpenRA.Game/Map/Map.cs
@@ -302,7 +302,7 @@ namespace OpenRA
 					return FieldLoader.GetValue<int>("MapFormat", search.Groups[1].Value);
 			}
 
-			throw new InvalidDataException($"MapFormat is not defined\n File: {p.Name}");
+			throw new InvalidDataException("MapFormat is not defined");
 		}
 
 		/// <summary>