diff --git a/scripts/system/create/entitySelectionTool/entitySelectionTool.js b/scripts/system/create/entitySelectionTool/entitySelectionTool.js
index c1b512cb10..98f1deb4ad 100644
--- a/scripts/system/create/entitySelectionTool/entitySelectionTool.js
+++ b/scripts/system/create/entitySelectionTool/entitySelectionTool.js
@@ -2044,12 +2044,11 @@ SelectionDisplay = (function() {
                     Vec3.print("    pickResult.intersection", pickResult.intersection);
                 }
 
-                // Duplicate entities if Ctrl is pressed.  This will make a
-                // copy of the selected entities and move the _original_ entities, not
-                // the new ones.
+                // Duplicate entities if Ctrl is pressed on Windows or Alt is press on Mac.
+                // This will make a copy of the selected entities and move the _original_ entities, not the new ones.
                 var isMac = Controller.getValue(Controller.Hardware.Application.PlatformMac);
-                var isControl = isMac ? event.isMeta : event.isControl;
-                if (isControl || doDuplicate) {
+                var isDuplicate = isMac ? event.isAlt : event.isControl;
+                if (isDuplicate || doDuplicate) {
                     duplicatedEntityIDs = SelectionManager.duplicateSelection();
                     var ids = [];
                     for (var i = 0; i < duplicatedEntityIDs.length; ++i) {
@@ -2272,12 +2271,11 @@ SelectionDisplay = (function() {
         addHandleTool(overlay, {
             mode: mode,
             onBegin: function(event, pickRay, pickResult) {
-                // Duplicate entities if Ctrl is pressed.  This will make a
-                // copy of the selected entities and move the _original_ entities, not
-                // the new ones.
+                // Duplicate entities if Ctrl is pressed on Windows or Alt is pressed on Mac.
+                // This will make a copy of the selected entities and move the _original_ entities, not the new ones.
                 var isMac = Controller.getValue(Controller.Hardware.Application.PlatformMac);
-                var isControl = isMac ? event.isMeta : event.isControl;
-                if (isControl) {
+                var isDuplicate = isMac ? event.isAlt : event.isControl;
+                if (isDuplicate) {
                     duplicatedEntityIDs = SelectionManager.duplicateSelection();
                     var ids = [];
                     for (var i = 0; i < duplicatedEntityIDs.length; ++i) {