diff --git a/wp-includes/customize/class-wp-customize-media-control.php b/wp-includes/customize/class-wp-customize-media-control.php
index f066c02245..4793b255bd 100644
--- a/wp-includes/customize/class-wp-customize-media-control.php
+++ b/wp-includes/customize/class-wp-customize-media-control.php
@@ -214,7 +214,7 @@ class WP_Customize_Media_Control extends WP_Customize_Control {
 			</div>
 			<div class="actions">
 				<# if ( data.defaultAttachment ) { #>
-					<button type="button" class="button default-button">{{ data.button_labels.default }}</button>
+					<button type="button" class="button default-button">{{ data.button_labels['default'] }}</button>
 				<# } #>
 				<# if ( data.canUpload ) { #>
 				<button type="button" class="button upload-button" id="{{ data.settings['default'] }}-button">{{ data.button_labels.select }}</button>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 595b9b0482..6622eb84af 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37416';
+$wp_version = '4.6-alpha-37417';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.