diff --git a/js/sound-generators/SoundGenerator.js b/js/sound-generators/SoundGenerator.js
index 6a9b4025..be5938ff 100644
--- a/js/sound-generators/SoundGenerator.js
+++ b/js/sound-generators/SoundGenerator.js
@@ -81,7 +81,7 @@ class SoundGenerator {
     // listener that updates the state of fullyEnabledProperty
     const updateFullyEnabledState = () => {
       this.fullyEnabledProperty.value = _.every(
-        this.enableControlProperties.getArray(),
+        this.enableControlProperties,
         enableControlProperty => enableControlProperty.value
       );
     };