diff --git a/src/emucore/tia/Player.cxx b/src/emucore/tia/Player.cxx
index d8b0ce5e3..d2936fe92 100644
--- a/src/emucore/tia/Player.cxx
+++ b/src/emucore/tia/Player.cxx
@@ -72,7 +72,7 @@ void Player::hmp(uInt8 value)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void Player::nusiz(uInt8 value)
+void Player::nusiz(uInt8 value, bool hblank)
 {
   const uInt8 masked = value & 0x07;
 
@@ -121,20 +121,20 @@ void Player::nusiz(uInt8 value)
 
       case 0x21:
       case 0x41:
-        if ((myRenderCounter - Count::renderCounterOffset) < 3) {
+        if ((myRenderCounter - Count::renderCounterOffset) < (hblank ? 4 : 3)) {
           setDivider(myDividerPending);
-        } else if ((myRenderCounter - Count::renderCounterOffset) < 5) {
+        } else if ((myRenderCounter - Count::renderCounterOffset) < (hblank ? 6 : 5)) {
           setDivider(myDividerPending);
           myRenderCounter--;
         } else {
-          myDividerChangeCounter = 1;
+          myDividerChangeCounter = (hblank ? 0 : 1);
         }
 
         break;
 
       case 0x42:
       case 0x24:
-        if (myRenderCounter < 1)
+        if (myRenderCounter < 1 || (hblank && (myRenderCounter % myDivider == 1)))
           setDivider(myDividerPending);
         else
           myDividerChangeCounter = (myDivider - (myRenderCounter - 1) % myDivider);
diff --git a/src/emucore/tia/Player.hxx b/src/emucore/tia/Player.hxx
index 4f6a76dc9..fb7091b6e 100644
--- a/src/emucore/tia/Player.hxx
+++ b/src/emucore/tia/Player.hxx
@@ -36,7 +36,7 @@ class Player : public Serializable
     void hmp(uInt8 value);
     uInt8 hmp() const { return myHmmClocks; }
 
-    void nusiz(uInt8 value);
+    void nusiz(uInt8 value, bool hblank);
 
     void resp(uInt8 counter);
 
diff --git a/src/emucore/tia/TIA.cxx b/src/emucore/tia/TIA.cxx
index fb85c041e..cfa96c936 100644
--- a/src/emucore/tia/TIA.cxx
+++ b/src/emucore/tia/TIA.cxx
@@ -507,13 +507,13 @@ bool TIA::poke(uInt16 address, uInt8 value)
     case NUSIZ0:
       myLinesSinceChange = 0;
       myMissile0.nusiz(value);
-      myPlayer0.nusiz(value);
+      myPlayer0.nusiz(value, myHstate == HState::blank);
       break;
 
     case NUSIZ1:
       myLinesSinceChange = 0;
       myMissile1.nusiz(value);
-      myPlayer1.nusiz(value);
+      myPlayer1.nusiz(value, myHstate == HState::blank);
       break;
 
     case HMM0: