diff --git a/src/common/SoundSDL2.cxx b/src/common/SoundSDL2.cxx
index 750832c0b..c39aa7d86 100644
--- a/src/common/SoundSDL2.cxx
+++ b/src/common/SoundSDL2.cxx
@@ -40,7 +40,10 @@ SoundSDL2::SoundSDL2(OSystem& osystem, AudioSettings& audioSettings)
     myIsInitializedFlag(false),
     myVolume(100),
     myVolumeFactor(0xffff),
+    myDevice(0),
+    myEmulationTiming(nullptr),
     myCurrentFragment(nullptr),
+    myUnderrun(false),
     myAudioSettings(audioSettings)
 {
   myOSystem.logMessage("SoundSDL2::SoundSDL2 started ...", 2);
diff --git a/src/emucore/EmulationWorker.cxx b/src/emucore/EmulationWorker.cxx
index 0ccdc77c5..337184a79 100644
--- a/src/emucore/EmulationWorker.cxx
+++ b/src/emucore/EmulationWorker.cxx
@@ -24,7 +24,15 @@
 using namespace std::chrono;
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-EmulationWorker::EmulationWorker() : myPendingSignal(Signal::none), myState(State::initializing)
+EmulationWorker::EmulationWorker()
+  : myPendingSignal(Signal::none),
+    myState(State::initializing),
+    myTia(nullptr),
+    myCyclesPerSecond(0),
+    myMaxCycles(0),
+    myMinCycles(0),
+    myDispatchResult(nullptr),
+    myTotalCycles(0)
 {
   std::mutex mutex;
   std::unique_lock<std::mutex> lock(mutex);
diff --git a/src/emucore/M6502.cxx b/src/emucore/M6502.cxx
index d1b2cea3b..48ee7fee0 100644
--- a/src/emucore/M6502.cxx
+++ b/src/emucore/M6502.cxx
@@ -59,6 +59,7 @@ M6502::M6502(const Settings& settings)
     icycles(0),
     myNumberOfDistinctAccesses(0),
     myLastAddress(0),
+    myLastBreakCycle(ULLONG_MAX),
     myLastPeekAddress(0),
     myLastPokeAddress(0),
     myLastPeekBaseAddress(0),
diff --git a/src/emucore/tia/TIA.cxx b/src/emucore/tia/TIA.cxx
index 3f04698db..071e13d99 100644
--- a/src/emucore/tia/TIA.cxx
+++ b/src/emucore/tia/TIA.cxx
@@ -144,7 +144,7 @@ void TIA::reset()
   myHstate = HState::blank;
   myCollisionMask = 0;
   myLinesSinceChange = 0;
-  myCollisionUpdateRequired = false;
+  myCollisionUpdateRequired = myCollisionUpdateScheduled = false;
   myColorLossEnabled = myColorLossActive = false;
   myColorHBlank = 0;
   myLastCycle = 0;
diff --git a/src/emucore/tia/TIA.hxx b/src/emucore/tia/TIA.hxx
index 41a7191ce..50bf080b6 100644
--- a/src/emucore/tia/TIA.hxx
+++ b/src/emucore/tia/TIA.hxx
@@ -746,6 +746,11 @@ class TIA : public Device
      */
     bool myCollisionUpdateRequired;
 
+    /**
+     * Force schedule a collision update
+     */
+    bool myCollisionUpdateScheduled;
+
     /**
      * The collision latches are represented by 15 bits in a bitfield.
      */
@@ -829,9 +834,6 @@ class TIA : public Device
     bool myEnableJitter;
     uInt8 myJitterFactor;
 
-    // Force schedule a collision update
-    bool myCollisionUpdateScheduled;
-
   #ifdef DEBUGGER_SUPPORT
     // The arrays containing information about every byte of TIA
     // indicating whether and how (RW) it is used.