diff --git a/js/ComboBox.js b/js/ComboBox.js
index 610a2beb..c17f2730 100644
--- a/js/ComboBox.js
+++ b/js/ComboBox.js
@@ -21,6 +21,7 @@ define( require => {
   'use strict';
 
   // modules
+  const AccessiblePeer = require( 'SCENERY/accessibility/AccessiblePeer' );
   const BooleanProperty = require( 'AXON/BooleanProperty' );
   const ComboBoxButton = require( 'SUN/ComboBoxButton' );
   const ComboBoxIO = require( 'SUN/ComboBoxIO' );
@@ -137,7 +138,15 @@ define( require => {
           fill: options.listFill,
           stroke: options.listStroke,
           lineWidth: options.listLineWidth,
-          visible: false
+          visible: false,
+
+          // a11y
+          // the list box is aria-labelledby its own label sibling
+          ariaLabelledbyAssociations: [ {
+            otherNode: this.button,
+            otherElementName: AccessiblePeer.LABEL_SIBLING,
+            thisElementName: AccessiblePeer.PRIMARY_SIBLING
+          } ]
         } );
       listParent.addChild( this.listBox );
       this.listParent = listParent; // @private
diff --git a/js/ComboBoxListBox.js b/js/ComboBoxListBox.js
index 43eb3fbb..8f0a1f9f 100644
--- a/js/ComboBoxListBox.js
+++ b/js/ComboBoxListBox.js
@@ -9,7 +9,6 @@ define( require => {
   'use strict';
 
   // modules
-  const AccessiblePeer = require( 'SCENERY/accessibility/AccessiblePeer' );
   const ComboBoxListItemNode = require( 'SUN/ComboBoxListItemNode' );
   const Emitter = require( 'AXON/Emitter' );
   const EmitterIO = require( 'AXON/EmitterIO' );
@@ -147,13 +146,6 @@ define( require => {
 
       super( content, options );
 
-      // a11y - the list box is aria-labelledby its own label sibling
-      this.addAriaLabelledbyAssociation( {
-        otherNode: button,
-        otherElementName: AccessiblePeer.LABEL_SIBLING,
-        thisElementName: AccessiblePeer.PRIMARY_SIBLING
-      } );
-
       // @public {ComboBoxListItemNode|null} the ComboBoxListItemNode that has focus
       this.focusedItemNode = null;