diff --git a/src/sound/SESoundInternal.cpp b/src/sound/SESoundInternal.cpp
index 56208c5..00c9d7b 100644
--- a/src/sound/SESoundInternal.cpp
+++ b/src/sound/SESoundInternal.cpp
@@ -32,7 +32,7 @@ float SESoundInternal::GetVolume() {
         auto channelGroupIndex = this->m_channelGroup;
 
         while (channelGroupIndex != -1) {
-            auto channelGroup = &SESound::s_ChannelGroups[this->m_channelGroup];
+            auto channelGroup = &SESound::s_ChannelGroups[channelGroupIndex];
             auto channelGroupVolume = channelGroup->m_volume * channelGroup->m_muteVolume;
 
             volume *= channelGroupVolume;