diff --git a/aegisub/src/text_file_reader.cpp b/aegisub/src/text_file_reader.cpp
index 0c7910c63..424b1ee5c 100644
--- a/aegisub/src/text_file_reader.cpp
+++ b/aegisub/src/text_file_reader.cpp
@@ -57,7 +57,7 @@ TextFileReader::TextFileReader(wxString const& filename, wxString encoding, bool
 : trim(trim)
 {
 	if (encoding.empty()) encoding = CharSetDetect::GetEncoding(filename);
-	file.reset(agi::io::Open(STD_STR(filename)));
+	file.reset(agi::io::Open(STD_STR(filename), true));
 	iter = agi::line_iterator<wxString>(*file, STD_STR(encoding));
 }