diff --git a/source/mididevices/music_wavewriter_mididevice.cpp b/source/mididevices/music_wavewriter_mididevice.cpp
index f8bf94e..5a959db 100644
--- a/source/mididevices/music_wavewriter_mididevice.cpp
+++ b/source/mididevices/music_wavewriter_mididevice.cpp
@@ -150,7 +150,7 @@ bool MIDIWaveWriter::CloseFile()
 			if (4 == fwrite(&size, 1, 4, File))
 			{
 				size = LittleLong(uint32_t(pos - 12 - sizeof(FmtChunk) - 8));
-				if (0 == fseek(File, 4 + sizeof(FmtChunk) + 4, SEEK_CUR))
+				if (0 == fseek(File, 4 + sizeof(FmtChunk) + 8, SEEK_CUR))
 				{
 					if (4 == fwrite(&size, 1, 4, File))
 					{