diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index afaba9f9..ff57f9af 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -1555,7 +1555,11 @@ DivMacroInt* DivPlatformOPL::getChanMacroInt(int ch) {
 }
 
 DivDispatchOscBuffer* DivPlatformOPL::getOscBuffer(int ch) {
-  if (ch>=totalChans) return NULL;
+  if (oplType==759) {
+    if (ch>=totalChans+1) return NULL;
+  } else {
+    if (ch>=totalChans) return NULL;
+  }
   if (oplType==3 && ch<12) {
     if (chan[ch&(~1)].fourOp) {
       if (ch&1) {