diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index e2d883f82..8787d0552 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -372,6 +372,7 @@ void DivPlatformGenesis::tick() {
     if (i==2 && extMode) continue;
     if (chan[i].freqChanged) {
       chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq));
+      if (chan[i].freq>262143) chan[i].freq=262143;
       int freqt=toFreq(chan[i].freq);
       immWrite(chanOffs[i]+ADDR_FREQH,freqt>>8);
       immWrite(chanOffs[i]+ADDR_FREQ,freqt&0xff);
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index bc418e901..382c89f53 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -270,6 +270,7 @@ void DivPlatformGenesisExt::tick() {
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
       opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch);
+      if (opChan[i].freq>262143) opChan[i].freq=262143;
       if (opChan[i].freq>=82432) {
         opChan[i].freqH=((opChan[i].freq>>15)&7)|0x38;
         opChan[i].freqL=(opChan[i].freq>>7)&0xff;
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index a9d59f63c..135e73fef 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -368,6 +368,7 @@ void DivPlatformYM2610::tick() {
     if (i==1 && extMode) continue;
     if (chan[i].freqChanged) {
       chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq));
+      if (chan[i].freq>262143) chan[i].freq=262143;
       int freqt=toFreq(chan[i].freq);
       immWrite(chanOffs[i]+ADDR_FREQH,freqt>>8);
       immWrite(chanOffs[i]+ADDR_FREQ,freqt&0xff);
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 567c24146..1cd17945b 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -234,6 +234,7 @@ void DivPlatformYM2610Ext::tick() {
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
       opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch);
+      if (opChan[i].freq>262143) opChan[i].freq=262143;
       int freqt=toFreq(opChan[i].freq);
       opChan[i].freqH=freqt>>8;
       opChan[i].freqL=freqt&0xff;