diff --git a/aegisub/src/ass_file.cpp b/aegisub/src/ass_file.cpp
index 37b66ae0e..84d94e290 100644
--- a/aegisub/src/ass_file.cpp
+++ b/aegisub/src/ass_file.cpp
@@ -480,7 +480,6 @@ void AssFile::LoadDefault(bool defline) {
 
 void AssFile::swap(AssFile &that) throw() {
 	// Intentionally does not swap undo stack related things
-	std::swap(filename, that.filename);
 	std::swap(loaded, that.loaded);
 	std::swap(commitId, that.commitId);
 	std::swap(undoDescription, that.undoDescription);