diff --git a/aegisub/audio_provider_ffmpegsource.cpp b/aegisub/audio_provider_ffmpegsource.cpp
index baa18bb73..b35eab4f6 100644
--- a/aegisub/audio_provider_ffmpegsource.cpp
+++ b/aegisub/audio_provider_ffmpegsource.cpp
@@ -124,7 +124,7 @@ void FFmpegSourceAudioProvider::LoadAudio(Aegisub::String filename) {
 		throw MsgString;
 	}
 
-	AudioSource = FFMS_CreateAudioSource(FileNameWX.char_str(), TrackNumber, Index, FFMSErrMsg, MsgSize);
+	AudioSource = FFMS_CreateAudioSource(FileNameWX.mb_str(wxConvLocal), TrackNumber, Index, FFMSErrMsg, MsgSize);
 	if (!AudioSource) {
 			wxString temp(FFMSErrMsg, wxConvUTF8);
 			MsgString << _T("Failed to open audio track: ") << temp;
diff --git a/aegisub/ffmpegsource_common.cpp b/aegisub/ffmpegsource_common.cpp
index 60beb7afa..c45954c8c 100644
--- a/aegisub/ffmpegsource_common.cpp
+++ b/aegisub/ffmpegsource_common.cpp
@@ -73,7 +73,7 @@ FrameIndex *FFmpegSourceProvider::DoIndexing(FrameIndex *Index, wxString FileNam
 	Progress.ProgressDialog->SetProgress(0,1);
 
 	// index all audio tracks
-	Index = FFMS_MakeIndex(FileNameWX.char_str(), Trackmask, FFMSTrackMaskNone, NULL, IgnoreDecodeErrors, FFmpegSourceProvider::UpdateIndexingProgress, &Progress, FFMSErrMsg, MsgSize);
+	Index = FFMS_MakeIndex(FileNameWX.mb_str(wxConvLocal), Trackmask, FFMSTrackMaskNone, NULL, IgnoreDecodeErrors, FFmpegSourceProvider::UpdateIndexingProgress, &Progress, FFMSErrMsg, MsgSize);
 	if (!Index) {
 		Progress.ProgressDialog->Destroy();
 		wxString temp(FFMSErrMsg, wxConvUTF8);
diff --git a/aegisub/video_provider_ffmpegsource.cpp b/aegisub/video_provider_ffmpegsource.cpp
index 8be509c82..d22e6ba9e 100644
--- a/aegisub/video_provider_ffmpegsource.cpp
+++ b/aegisub/video_provider_ffmpegsource.cpp
@@ -127,7 +127,7 @@ void FFmpegSourceVideoProvider::LoadVideo(Aegisub::String filename, double fps)
 		throw ErrorMsg;
 	}
 
-	VideoSource = FFMS_CreateVideoSource(FileNameWX.char_str(), TrackNumber, Index, "", Threads, SeekMode, FFMSErrorMessage, MessageSize);
+	VideoSource = FFMS_CreateVideoSource(FileNameWX.mb_str(wxConvLocal), TrackNumber, Index, "", Threads, SeekMode, FFMSErrorMessage, MessageSize);
 	if (VideoSource == NULL) {
 		wxString temp(FFMSErrorMessage, wxConvUTF8);
 		ErrorMsg << _T("Failed to open video track: ") << temp;