diff --git a/src/engine/platform/ay.h b/src/engine/platform/ay.h
index 430d5631c..e8d7efcec 100644
--- a/src/engine/platform/ay.h
+++ b/src/engine/platform/ay.h
@@ -80,7 +80,8 @@ class DivPlatformAY8910: public DivDispatch {
         nextPSGMode(PSGMode(1)),
         dac(DAC()),
         autoEnvNum(0),
-        autoEnvDen(0) {}
+        autoEnvDen(0),
+        konCycles(0) {}
     };
     Channel chan[3];
     bool isMuted[3];
diff --git a/src/engine/platform/ay8930.h b/src/engine/platform/ay8930.h
index d51ebf0de..0bd2171a1 100644
--- a/src/engine/platform/ay8930.h
+++ b/src/engine/platform/ay8930.h
@@ -90,7 +90,8 @@ class DivPlatformAY8930: public DivDispatch {
         dac(DAC()),
         autoEnvNum(0),
         autoEnvDen(0),
-        duty(4) {}
+        duty(4),
+        konCycles(0) {}
     };
     Channel chan[3];
     bool isMuted[3];