diff --git a/core/shortcut_items.ts b/core/shortcut_items.ts
index afbea3ab2..224678bc0 100644
--- a/core/shortcut_items.ts
+++ b/core/shortcut_items.ts
@@ -99,9 +99,6 @@ export function registerCopy() {
   const ctrlC = ShortcutRegistry.registry.createSerializedKey(KeyCodes.C, [
     KeyCodes.CTRL,
   ]);
-  const altC = ShortcutRegistry.registry.createSerializedKey(KeyCodes.C, [
-    KeyCodes.ALT,
-  ]);
   const metaC = ShortcutRegistry.registry.createSerializedKey(KeyCodes.C, [
     KeyCodes.META,
   ]);
@@ -138,7 +135,7 @@ export function registerCopy() {
         : null;
       return !!copyData;
     },
-    keyCodes: [ctrlC, altC, metaC],
+    keyCodes: [ctrlC, metaC],
   };
   ShortcutRegistry.registry.register(copyShortcut);
 }
@@ -150,9 +147,6 @@ export function registerCut() {
   const ctrlX = ShortcutRegistry.registry.createSerializedKey(KeyCodes.X, [
     KeyCodes.CTRL,
   ]);
-  const altX = ShortcutRegistry.registry.createSerializedKey(KeyCodes.X, [
-    KeyCodes.ALT,
-  ]);
   const metaX = ShortcutRegistry.registry.createSerializedKey(KeyCodes.X, [
     KeyCodes.META,
   ]);
@@ -197,7 +191,7 @@ export function registerCut() {
       }
       return false;
     },
-    keyCodes: [ctrlX, altX, metaX],
+    keyCodes: [ctrlX, metaX],
   };
 
   ShortcutRegistry.registry.register(cutShortcut);
@@ -210,9 +204,6 @@ export function registerPaste() {
   const ctrlV = ShortcutRegistry.registry.createSerializedKey(KeyCodes.V, [
     KeyCodes.CTRL,
   ]);
-  const altV = ShortcutRegistry.registry.createSerializedKey(KeyCodes.V, [
-    KeyCodes.ALT,
-  ]);
   const metaV = ShortcutRegistry.registry.createSerializedKey(KeyCodes.V, [
     KeyCodes.META,
   ]);
@@ -245,7 +236,7 @@ export function registerPaste() {
       const centerCoords = new Coordinate(left + width / 2, top + height / 2);
       return !!clipboard.paste(copyData, copyWorkspace, centerCoords);
     },
-    keyCodes: [ctrlV, altV, metaV],
+    keyCodes: [ctrlV, metaV],
   };
 
   ShortcutRegistry.registry.register(pasteShortcut);
@@ -258,9 +249,6 @@ export function registerUndo() {
   const ctrlZ = ShortcutRegistry.registry.createSerializedKey(KeyCodes.Z, [
     KeyCodes.CTRL,
   ]);
-  const altZ = ShortcutRegistry.registry.createSerializedKey(KeyCodes.Z, [
-    KeyCodes.ALT,
-  ]);
   const metaZ = ShortcutRegistry.registry.createSerializedKey(KeyCodes.Z, [
     KeyCodes.META,
   ]);
@@ -277,7 +265,7 @@ export function registerUndo() {
       e.preventDefault();
       return true;
     },
-    keyCodes: [ctrlZ, altZ, metaZ],
+    keyCodes: [ctrlZ, metaZ],
   };
   ShortcutRegistry.registry.register(undoShortcut);
 }
@@ -291,10 +279,6 @@ export function registerRedo() {
     KeyCodes.SHIFT,
     KeyCodes.CTRL,
   ]);
-  const altShiftZ = ShortcutRegistry.registry.createSerializedKey(KeyCodes.Z, [
-    KeyCodes.SHIFT,
-    KeyCodes.ALT,
-  ]);
   const metaShiftZ = ShortcutRegistry.registry.createSerializedKey(KeyCodes.Z, [
     KeyCodes.SHIFT,
     KeyCodes.META,
@@ -316,7 +300,7 @@ export function registerRedo() {
       e.preventDefault();
       return true;
     },
-    keyCodes: [ctrlShiftZ, altShiftZ, metaShiftZ, ctrlY],
+    keyCodes: [ctrlShiftZ, metaShiftZ, ctrlY],
   };
   ShortcutRegistry.registry.register(redoShortcut);
 }
diff --git a/tests/mocha/keydown_test.js b/tests/mocha/keydown_test.js
index 4ad0da2d4..a4c81a80c 100644
--- a/tests/mocha/keydown_test.js
+++ b/tests/mocha/keydown_test.js
@@ -132,12 +132,6 @@ suite('Key Down', function () {
           Blockly.utils.KeyCodes.META,
         ]),
       ],
-      [
-        'Alt C',
-        createKeyDownEvent(Blockly.utils.KeyCodes.C, [
-          Blockly.utils.KeyCodes.ALT,
-        ]),
-      ],
     ];
     // Copy a block.
     suite('Simple', function () {
@@ -223,12 +217,6 @@ suite('Key Down', function () {
           Blockly.utils.KeyCodes.META,
         ]),
       ],
-      [
-        'Alt Z',
-        createKeyDownEvent(Blockly.utils.KeyCodes.Z, [
-          Blockly.utils.KeyCodes.ALT,
-        ]),
-      ],
     ];
     // Undo.
     suite('Simple', function () {
@@ -289,13 +277,6 @@ suite('Key Down', function () {
           Blockly.utils.KeyCodes.SHIFT,
         ]),
       ],
-      [
-        'Alt Shift Z',
-        createKeyDownEvent(Blockly.utils.KeyCodes.Z, [
-          Blockly.utils.KeyCodes.ALT,
-          Blockly.utils.KeyCodes.SHIFT,
-        ]),
-      ],
     ];
     // Undo.
     suite('Simple', function () {