diff --git a/src/emucore/tia/core_6502ts/Ball.cxx b/src/emucore/tia/core_6502ts/Ball.cxx
index 02267909a..f058247ad 100644
--- a/src/emucore/tia/core_6502ts/Ball.cxx
+++ b/src/emucore/tia/core_6502ts/Ball.cxx
@@ -27,7 +27,7 @@ namespace TIA6502tsCore {
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Ball::Ball(uInt32 collisionMask)
   : myCollisionMaskDisabled(collisionMask),
-    myCollisionMaskEnabled(0x8000),
+    myCollisionMaskEnabled(0xFFFF),
     mySupressed(false)
 {
   reset();
@@ -92,7 +92,7 @@ void Ball::vdelbl(uInt8 value)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Ball::toggleCollisions(bool enabled)
 {
-  myCollisionMaskEnabled = enabled ? 0x8000 : (0x8000 | myCollisionMaskDisabled);
+  myCollisionMaskEnabled = enabled ? 0xFFFF : (0x8000 | myCollisionMaskDisabled);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
diff --git a/src/emucore/tia/core_6502ts/Missile.cxx b/src/emucore/tia/core_6502ts/Missile.cxx
index 6559648f2..658b32f17 100644
--- a/src/emucore/tia/core_6502ts/Missile.cxx
+++ b/src/emucore/tia/core_6502ts/Missile.cxx
@@ -29,7 +29,7 @@ namespace TIA6502tsCore {
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Missile::Missile(uInt32 collisionMask)
   : myCollisionMaskDisabled(collisionMask),
-    myCollisionMaskEnabled(0x8000),
+    myCollisionMaskEnabled(0xFFFF),
     mySupressed(false)
 {
   reset();
@@ -90,7 +90,7 @@ void Missile::resmp(uInt8 value, const Player& player)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Missile::toggleCollisions(bool enabled)
 {
-  myCollisionMaskEnabled = enabled ? 0x8000 : (0x8000 | myCollisionMaskDisabled);
+  myCollisionMaskEnabled = enabled ? 0xFFFF : (0x8000 | myCollisionMaskDisabled);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
diff --git a/src/emucore/tia/core_6502ts/Player.cxx b/src/emucore/tia/core_6502ts/Player.cxx
index 0fd6d199e..975e52ff6 100644
--- a/src/emucore/tia/core_6502ts/Player.cxx
+++ b/src/emucore/tia/core_6502ts/Player.cxx
@@ -29,7 +29,7 @@ namespace TIA6502tsCore {
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Player::Player(uInt32 collisionMask)
   : myCollisionMaskDisabled(collisionMask),
-    myCollisionMaskEnabled(0x8000),
+    myCollisionMaskEnabled(0xFFFF),
     mySupressed(false)
 {
   reset();
@@ -126,7 +126,7 @@ void Player::toggleEnabled(bool enabled)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Player::toggleCollisions(bool enabled)
 {
-  myCollisionMaskEnabled = enabled ? 0x8000 : (0x8000 | myCollisionMaskDisabled);
+  myCollisionMaskEnabled = enabled ? 0xFFFF : (0x8000 | myCollisionMaskDisabled);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
diff --git a/src/emucore/tia/core_6502ts/Playfield.cxx b/src/emucore/tia/core_6502ts/Playfield.cxx
index 9a8cb8d5a..e89dc589e 100644
--- a/src/emucore/tia/core_6502ts/Playfield.cxx
+++ b/src/emucore/tia/core_6502ts/Playfield.cxx
@@ -24,7 +24,7 @@ namespace TIA6502tsCore {
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Playfield::Playfield(uInt32 collisionMask)
   : myCollisionMaskDisabled(collisionMask),
-    myCollisionMaskEnabled(0x8000),
+    myCollisionMaskEnabled(0xFFFF),
     mySupressed(false)
 {
   reset();
@@ -103,7 +103,7 @@ void Playfield::toggleEnabled(bool enabled)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void Playfield::toggleCollisions(bool enabled)
 {
-  myCollisionMaskEnabled = enabled ? 0x8000 : (0x8000 | myCollisionMaskDisabled);
+  myCollisionMaskEnabled = enabled ? 0xFFFF : (0x8000 | myCollisionMaskDisabled);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
diff --git a/src/emucore/tia/core_6502ts/TIA.cxx b/src/emucore/tia/core_6502ts/TIA.cxx
index 003baa042..14e88d715 100644
--- a/src/emucore/tia/core_6502ts/TIA.cxx
+++ b/src/emucore/tia/core_6502ts/TIA.cxx
@@ -58,12 +58,12 @@ TIA::TIA(Console& console, Sound& sound, Settings& settings)
     myDelayQueue(10, 20),
     mySpriteEnabledBits(0xFF),
     myCollisionsEnabledBits(0xFF),
-    myPlayfield(CollisionMask::playfield),
-    myMissile0(CollisionMask::missile0),
-    myMissile1(CollisionMask::missile1),
-    myPlayer0(CollisionMask::player0),
-    myPlayer1(CollisionMask::player1),
-    myBall(CollisionMask::ball)
+    myPlayfield(~CollisionMask::playfield & 0x7FFF),
+    myMissile0(~CollisionMask::missile0 & 0x7FFF),
+    myMissile1(~CollisionMask::missile1 & 0x7FFF),
+    myPlayer0(~CollisionMask::player0 & 0x7FFF),
+    myPlayer1(~CollisionMask::player1 & 0x7FFF),
+    myBall(~CollisionMask::ball & 0x7FFF)
 {
   myFrameManager.setHandlers(
     [this] () {
@@ -900,12 +900,12 @@ void TIA::nextLine()
 void TIA::updateCollision()
 {
   myCollisionMask |= (
-    ~myPlayer0.collision &
-    ~myPlayer1.collision &
-    ~myMissile0.collision &
-    ~myMissile1.collision &
-    ~myBall.collision &
-    ~myPlayfield.collision
+    myPlayer0.collision &
+    myPlayer1.collision &
+    myMissile0.collision &
+    myMissile1.collision &
+    myBall.collision &
+    myPlayfield.collision
   );
 }