diff --git a/LEGO1/mxwavepresenter.cpp b/LEGO1/mxwavepresenter.cpp
index 53c414f1..8305c55c 100644
--- a/LEGO1/mxwavepresenter.cpp
+++ b/LEGO1/mxwavepresenter.cpp
@@ -5,6 +5,8 @@
 #include "mxomni.h"
 #include "mxsoundmanager.h"
 
+#include <limits.h>
+
 DECOMP_SIZE_ASSERT(MxWavePresenter, 0x6c);
 DECOMP_SIZE_ASSERT(MxWavePresenter::WaveFormat, 0x1c);
 
@@ -124,7 +126,7 @@ void MxWavePresenter::StartingTickle()
 		waveFormatEx.wBitsPerSample = m_waveFormat->m_waveFormatEx.wBitsPerSample;
 
 		if (waveFormatEx.wBitsPerSample == 8)
-			m_unk67 = 0x7f;
+			m_unk67 = SCHAR_MAX;
 
 		if (waveFormatEx.wBitsPerSample == 16)
 			m_unk67 = 0;
diff --git a/LEGO1/mxwavepresenter.h b/LEGO1/mxwavepresenter.h
index 30a2c1f8..0699f003 100644
--- a/LEGO1/mxwavepresenter.h
+++ b/LEGO1/mxwavepresenter.h
@@ -64,7 +64,7 @@ class MxWavePresenter : public MxSoundPresenter {
 	MxU8 m_unk64;
 	MxBool m_unk65;
 	MxBool m_unk66;
-	undefined m_unk67;
+	MxS8 m_unk67;
 	undefined m_unk68;
 };