diff --git a/aegisub/src/dialog_style_manager.cpp b/aegisub/src/dialog_style_manager.cpp
index 713ac33f7..c112c0a1e 100644
--- a/aegisub/src/dialog_style_manager.cpp
+++ b/aegisub/src/dialog_style_manager.cpp
@@ -38,6 +38,7 @@
 #include "ass_dialogue.h"
 #include "ass_file.h"
 #include "ass_style.h"
+#include "charset_detect.h"
 #include "compat.h"
 #include "dialog_selected_choices.h"
 #include "dialog_style_editor.h"
@@ -565,13 +566,21 @@ void DialogStyleManager::OnCurrentImport() {
 	auto filename = OpenFileSelector(_("Open subtitles file"), "Path/Last/Subtitles", "", "", SubtitleFormat::GetWildcards(0), this);
 	if (filename.empty()) return;
 
+	std::string charset;
+	try {
+		charset = CharSetDetect::GetEncoding(filename);
+	}
+	catch (agi::UserCancelException const&) {
+		return;
+	}
+
 	AssFile temp;
 	try {
 		auto reader = SubtitleFormat::GetReader(filename);
 		if (!reader)
 			wxMessageBox("Unsupported subtitle format", "Error", wxOK | wxICON_ERROR | wxCENTER, this);
 		else
-			reader->ReadFile(&temp, filename);
+			reader->ReadFile(&temp, filename, charset);
 	}
 	catch (agi::Exception const& err) {
 		wxMessageBox(to_wx(err.GetChainedMessage()), "Error", wxOK | wxICON_ERROR | wxCENTER, this);
diff --git a/aegisub/src/subtitle_format.h b/aegisub/src/subtitle_format.h
index b330d7413..7f0a1ed32 100644
--- a/aegisub/src/subtitle_format.h
+++ b/aegisub/src/subtitle_format.h
@@ -110,8 +110,8 @@ public:
 	/// Load a subtitle file
 	/// @param[out] target Destination to read lines into
 	/// @param filename File to load
-	/// @param forceEncoding Encoding to use or empty string for default
-	virtual void ReadFile(AssFile *target, agi::fs::path const& filename, std::string const& forceEncoding="") const { }
+	/// @param encoding Encoding to use. May be ignored by the reader.
+	virtual void ReadFile(AssFile *target, agi::fs::path const& filename, std::string const& encoding) const { }
 
 	/// Save a subtitle file
 	/// @param src Data to write