diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 0d00756ec..46c43c5b2 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2175,7 +2175,7 @@ void DivEngine::recalcChans() {
   int chanIndex=0;
   memset(isInsTypePossible,0,DIV_INS_MAX*sizeof(bool));
   for (int i=0; i<song.systemLen; i++) {
-    int chanCount=getChannelCount(song.system[i]);
+    int chanCount=song.systemChans[i];
     int firstChan=chans;
     chans+=chanCount;
     for (int j=0; j<chanCount; j++) {
diff --git a/src/engine/song.h b/src/engine/song.h
index 83daab1de..cc911af17 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -400,6 +400,7 @@ struct DivSong {
 
   std::vector<DivEffectStorage> effects;
 
+  // INTERNAL STATE - do not modify.
   DivInstrument nullIns, nullInsOPLL, nullInsOPL, nullInsOPLDrums, nullInsQSound, nullInsESFM;
   DivWavetable nullWave;
   DivSample nullSample;