diff --git a/src/common/RewindManager.cxx b/src/common/RewindManager.cxx
index 70fa481d7..bc6b70813 100644
--- a/src/common/RewindManager.cxx
+++ b/src/common/RewindManager.cxx
@@ -37,7 +37,6 @@ RewindManager::RewindManager(OSystem& system, StateManager& statemgr)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void RewindManager::setup()
 {
-  myStateSize = 0;
   myLastTimeMachineAdd = false;
 
   const string& prefix = myOSystem.settings().getBool("dev.settings") ? "dev." : "plr.";
@@ -138,7 +137,6 @@ bool RewindManager::addState(const string& message, bool timeMachine)
   s.rewind();  // rewind Serializer internal buffers
   if(myStateManager.saveState(s) && myOSystem.console().tia().saveDisplay(s))
   {
-    myStateSize = std::max(myStateSize, uInt32(s.size()));
     state.message = message;
     state.cycles = myOSystem.console().tia().cycles();
     myLastTimeMachineAdd = timeMachine;
@@ -256,18 +254,22 @@ string RewindManager::saveAllStates()
     buf.str("");
     out.putString(STATE_HEADER);
     out.putShort(numStates);
-    out.putInt(myStateSize);
 
-    unique_ptr<uInt8[]> buffer = make_unique<uInt8[]>(myStateSize);
     for (uInt32 i = 0; i < numStates; ++i)
     {
       RewindState& state = myStateList.current();
       Serializer& s = state.data;
+      uInt32 stateSize = uInt32(s.size());
+      unique_ptr<uInt8[]> buffer = make_unique<uInt8[]>(stateSize);
+
+      out.putInt(stateSize);
+
       // Rewind Serializer internal buffers
       s.rewind();
+
       // Save state
-      s.getByteArray(buffer.get(), myStateSize);
-      out.putByteArray(buffer.get(), myStateSize);
+      s.getByteArray(buffer.get(), stateSize);
+      out.putByteArray(buffer.get(), stateSize);
       out.putString(state.message);
       out.putLong(state.cycles);
 
@@ -310,25 +312,27 @@ string RewindManager::loadAllStates()
     if (in.getString() != STATE_HEADER)
       return "Incompatible all states file";
     numStates = in.getShort();
-    myStateSize = in.getInt();
 
-    unique_ptr<uInt8[]> buffer = make_unique<uInt8[]>(myStateSize);
     for (uInt32 i = 0; i < numStates; ++i)
     {
       if (myStateList.full())
         compressStates();
 
+      uInt32 stateSize = in.getInt();
+      unique_ptr<uInt8[]> buffer = make_unique<uInt8[]>(stateSize);
+
       // Add new state at the end of the list (queue adds at end)
       // This updates the 'current' iterator inside the list
       myStateList.addLast();
       RewindState& state = myStateList.current();
       Serializer& s = state.data;
+
       // Rewind Serializer internal buffers
       s.rewind();
 
       // Fill new state with saved values
-      in.getByteArray(buffer.get(), myStateSize);
-      s.putByteArray(buffer.get(), myStateSize);
+      in.getByteArray(buffer.get(), stateSize);
+      s.putByteArray(buffer.get(), stateSize);
       state.message = in.getString();
       state.cycles = in.getLong();
     }
diff --git a/src/common/RewindManager.hxx b/src/common/RewindManager.hxx
index 619af7264..5f53083f7 100644
--- a/src/common/RewindManager.hxx
+++ b/src/common/RewindManager.hxx
@@ -144,7 +144,6 @@ class RewindManager
     bool atLast() const  { return myStateList.atLast();  }
     void resize(uInt32 size) { myStateList.resize(size); }
     void clear() {
-      myStateSize = 0;
       myStateList.clear();
     }
 
@@ -176,7 +175,6 @@ class RewindManager
     uInt64 myHorizon{0};
     double myFactor{0.0};
     bool   myLastTimeMachineAdd{false};
-    uInt32 myStateSize{0};
 
     struct RewindState {
       Serializer data;  // actual save state
diff --git a/src/emucore/Serializer.cxx b/src/emucore/Serializer.cxx
index 80282bdc2..7f94dced2 100644
--- a/src/emucore/Serializer.cxx
+++ b/src/emucore/Serializer.cxx
@@ -91,6 +91,8 @@ void Serializer::rewind()
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 size_t Serializer::size() const
 {
+  myStream->seekp(0, std::ios::end);
+
   return myStream->tellp();
 }