diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index 13eee6a39..d28bdaa28 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -724,8 +724,6 @@ void DivPlatformOPL::acquire_ymfm4(short** buf, size_t len) {
       unsigned char oscOffs=i+pcmChanOffs;
       int chOut=pcmChan[i]->debug_output(0);
       chOut+=pcmChan[i]->debug_output(1);
-      chOut+=pcmChan[i]->debug_output(2);
-      chOut+=pcmChan[i]->debug_output(3);
       oscBuf[oscOffs]->putSample(h,CLAMP(chOut<<1,-32768,32767));
     }
   }