diff --git a/src/engine/platform/ay.h b/src/engine/platform/ay.h
index 430d5631..e8d7efce 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 d51ebf0d..0bd2171a 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];
diff --git a/src/engine/platform/fmshared_OPN.h b/src/engine/platform/fmshared_OPN.h
index 19eec0aa..a8ec6772 100644
--- a/src/engine/platform/fmshared_OPN.h
+++ b/src/engine/platform/fmshared_OPN.h
@@ -133,6 +133,7 @@ class DivPlatformOPN: public DivPlatformFMBase {
         freqH(0),
         freqL(0),
         portaPauseFreq(0),
+        konCycles(0),
         mask(true) {}
     };
 
diff --git a/src/engine/platform/qsound.h b/src/engine/platform/qsound.h
index 18eb886b..dbdffd05 100644
--- a/src/engine/platform/qsound.h
+++ b/src/engine/platform/qsound.h
@@ -35,6 +35,7 @@ class DivPlatformQSound: public DivDispatch {
       SharedChannel<int>(255),
       resVol(4095),
       sample(-1),
+      wave(-1),
       panning(0x10),
       echo(0),
       useWave(false),