diff --git a/src/engine/platform/ym2203.cpp b/src/engine/platform/ym2203.cpp
index f346882ee..c85ba93cb 100644
--- a/src/engine/platform/ym2203.cpp
+++ b/src/engine/platform/ym2203.cpp
@@ -1398,6 +1398,7 @@ int DivPlatformYM2203::init(DivEngine* p, int channels, int sugRate, const DivCo
   fm->set_fidelity(ymfm::OPN_FIDELITY_MIN);
   // YM2149, 2MHz
   ay=new DivPlatformAY8910(true,chipClock,ayDiv);
+  ay->setCore(0);
   ay->init(p,3,sugRate,ayFlags);
   ay->toggleRegisterDump(true);
   setFlags(flags);
diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
index f025562f7..8cf053e94 100644
--- a/src/engine/platform/ym2608.cpp
+++ b/src/engine/platform/ym2608.cpp
@@ -2036,6 +2036,7 @@ int DivPlatformYM2608::init(DivEngine* p, int channels, int sugRate, const DivCo
   fm->set_fidelity(ymfm::OPN_FIDELITY_MIN);
   // YM2149, 2MHz
   ay=new DivPlatformAY8910(true,chipClock,ayDiv,48);
+  ay->setCore(0);
   ay->init(p,3,sugRate,ayFlags);
   ay->toggleRegisterDump(true);
   setFlags(flags);
diff --git a/src/engine/platform/ym2610shared.h b/src/engine/platform/ym2610shared.h
index 2e6d738ea..ea9d66031 100644
--- a/src/engine/platform/ym2610shared.h
+++ b/src/engine/platform/ym2610shared.h
@@ -348,6 +348,7 @@ class DivPlatformYM2610Base: public DivPlatformOPN {
       setFlags(flags);
       // YM2149, 2MHz
       ay=new DivPlatformAY8910(true,chipClock,32,144);
+      ay->setCore(0);
       ay->init(p,3,sugRate,ayFlags);
       ay->toggleRegisterDump(true);
       return 0;